Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d89bfda524cf3b…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 01:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2beb9f6c5fc3d40b7ba612a6c64f502d SHA-1: 8a1cb0c1b80db2a15dbbe0a304aee302a1909d88 SHA-256: c7d89bfda524cf3b03e639e00de868f53d19c914fb341ecb753e6f0358a637ba
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and numerous external links, many of which point to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and external URLs suggest an attempt to execute code or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=gangstar+vegas+videos PDF link annotation
    • https://9ja-bet.com/userfiles/file/pitinu.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/27486813535.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/18208148459.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bab0d92cae---34391138698.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/marudukopomefedoxebawuvi.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/sokom.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/62b82c87b1b0360b0b0a43d5d8929849/61665903123.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/sofarikaxox.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614904d9cf9f7---79288086936.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/zekizazolinafem.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/subiwijakosabexopevo.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/21662192249.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/fofikirotivevu.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/44075455204.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315cb9d1018---lepokokulupimijuvi.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/5896726970.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/bogigetenuxopadegesaf.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/vurebenizotitarobiribo.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/ratekizil.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/65793126341.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/93071418427.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/pofamuxamofa.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/38056768081.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_off0000ae85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE85 10484 bytes
SHA-256: 92f33680cd84d48d68a1cc5c558384b96f3b37295421693f067946046f3727bf
font_01_sfnt_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 16256 bytes
SHA-256: 62a2b6a8baa507c1c734a3a46269ab913875a978f25083cff0eca355f5314ac3
font_02_sfnt_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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