Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed494930ccd374cb…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 04:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f070b8808aade575705fcb42e84ebd7 SHA-1: 7ce8b8656f5d6c2cf7785d1637b2e9814abbe92c SHA-256: ed494930ccd374cb55c24d44c80615ea111035ee174bfa2c75d69c89cf6738fa
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple heuristics indicating it is a lure for malicious downloads, including fake invoice language, a visual download button, and callback phishing elements. It also features numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/samopokolikejudelum.pdf In PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608444418ab86---pomaweru.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab5775578b---76376065437.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/611b20e88a9490eb2b62769ec133df68/96570925261.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/17b82a7f4b5b4e3c80efb9ecca015ef4/filabevurasalebedibajo.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/pusopolemowojidigozimevim.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/getawupulejatakugopejig.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607190f3c1874---vujivaziwamilisovi.pdfIn PDF document text
    • https://wita.lt/images/files/bezutitup.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/pufuvawure.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077fb9ce6089---mixozajobidekogogugazutuk.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/8e9c66b9f58471a5759f37f5d91e67b9/binerosewituxibun.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/tetenozulopakiruwus.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/af1b8caa9f3ba01834e11294244ed761/xorexovuwijifiwawufab.pdfIn PDF document text
    • https://denimder.org/resimler/files/45952467868.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb643633d---pebopov.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca7802096---29965448320.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/2300427381.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/fujawidedibudunebudatoku.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/gegorapodudisesesap.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/meratefowozesedi.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/9154489522.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jibirapesanenolosebolur.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8298fa616aa07bcc5dc3dfaa0098045e/foriserarozukokefe.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/repagupuzamaduver.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=form+26q+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 17612 bytes
SHA-256: c7d0e991ef74d03913b993a18c5c21b19e6c5c82e6cfbd32ef9a01f08b2863f4
font_01_sfnt_off00010943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001215a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 10268 bytes
SHA-256: c7ef02b68e1539e0bea3ee34c63e868f0d5117fa56972987e0dae04a38ad502f

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