Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2e27e1b44b791b7…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 09:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e44cb5dcb1c4a52eddb2fc1e6b7e79e SHA-1: 9f323e2033567034f6373c7cb0b68d475bd44f76 SHA-256: f2e27e1b44b791b752051fb75dab9bc7186de56722f1cbf60d992033939d3712
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to host and distribute malicious content. The presence of a visual download button further supports a lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 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.
  • 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://wastran.ru/uplcv?utm_term=download+manager+for+android+pro+apk PDF link annotation
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/zewog.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/rufefedavevomonuro.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/lofofiseleb.pdfIn PDF document text
    • http://precisao.org/files/files/nojesozuzikoxejapunotomu.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/gebogupirovuwokijudup.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/juxekavibusileko.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/11934249735.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ed81e288---62206523768.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///suvimotabomofubexid.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/48948059107.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/04c9069a27061bb58745e9c30f61a9d1/fowaxinu.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/79317291870.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136508ab13ff---jivifexekepajimuritewamam.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/panoxobopowumukipagazivo.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/sabute.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/11132332342.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f2d66ab2---13810910490.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/46021734901.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/zuzizefizupama.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/10745266839.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/mukegivalizonetigiraviji.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/15666435465.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/47397152191.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/10574032856.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b824569bc591ebdc208c9321a512158/82477091385.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_off0000c6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A1 10752 bytes
SHA-256: ca48193ddfd768b1d7236941a9f6ad48a309b6ae3ad46a6b14eb8f32bf771686
font_01_sfnt_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 18120 bytes
SHA-256: 4df5becb2e76f533d2d490f86b94b3a56e4fb6f19e1236207bb2c7c249cddc77
font_02_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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