Malicious PDF — malware analysis report

Static analysis result for SHA-256 09156e864b2abc6b…

MALICIOUS

PDF

84.1 KB Created: 2021-07-02 00:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 67500ad5d9e22b2b3ca61ad3b741cc04 SHA-1: 6fbd2c90c64f9b8e089a3f453eb41991d4796cf3 SHA-256: 09156e864b2abc6bc385febe230e32f0692782b9363b88365e87a98ee95787fb
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a download button lure and a callback phishing pretext suggests a social engineering attempt to trick the user. Several URLs pointing to compromised CMS upload storage and disposable hosting were extracted, indicating a likely distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • 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://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/903cd269d982fc601af970eb989c9886/kojugi.pdf In PDF document text
    • http://wintec-samu.hu/uploads/files/tazapozisugon.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b659aedad0bf4c7b0d851b00f5c663e0/99816705183.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/87848718268.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bda83afb---80189453351.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/fovotugowixegumorux.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210622080356.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bea6d263e---vojofebegupefivusozulad.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/46720440534.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/nipifewixazufom.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/42172557245.pdfIn PDF document text
    • https://7gking.tw/upload/files/25978621034.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d02b177efe---96773184651.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c063b5c738b---47590017839.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///sogefif.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/9000867050.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/106ecf3998aa3c7b5f7ac636b08ee597/pafozatokezaket.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090696ebd6eb---63822277818.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d9f984542---kadivizaxawakesi.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/rulukuriwilugokan.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/wivasotemojesivipipuwa.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/93085502402.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/sjm9koundiplmti8hgd37p5qho/66055824980.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b73ba9897ee---bixuxesibe.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/jotivemonekoliwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=separate+pdf+in+pagesPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903da44594d---fekabafudukof.pdfIn PDF document text
    • 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_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 10584 bytes
SHA-256: 1bf7bf8fbfe15252d4bd54f338a48e33058172514db4d20de9761a7a74d3a33c
font_01_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 16632 bytes
SHA-256: 6309877d427d04be94db869c8cf676131a06245bcf6edb5db62c381d1d798862
font_02_sfnt_off0001296f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1