Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cc12e7c22a94c0…

MALICIOUS

PDF

77.3 KB Created: 2021-08-25 07:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7009057e45f0c71fb43827746503bd6e SHA-1: a49a2724e710543f7125791be5d3ff0a5b1bc345 SHA-256: 63cc12e7c22a94c073df9b34f8c3a5b260f11cc7e8b90890a18a2b3b9b9cd26e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • 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 http://stpatricksreunion.com/clients/84553/File/70180302483.pdf In PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/71221644442.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609492340c463---57379284544.pdfIn PDF document text
    • https://termoformat.md/img/files/93365979265.pdfIn PDF document text
    • http://zae.me/datafiles/file/66923273771.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/178175f14ec6f80b53070b600566d84f/73989582754.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/mewujaduvafabalegagukaso.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/wufosidozojulaj.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/nogoxotimikegokapov.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/18490298047.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/378dae2b15df35fd842a5f12f19c1e53/24677114525.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/u7ejlgpettlk3q09nmq0r2g5m6/doludafekoxukakimidugodu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b9ee534b---58314075329.pdfIn PDF document text
    • http://idroter.org/userfiles/files/73778153968.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/sasuvatagomataropukak.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91fe878e34---59378311543.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/n826a5ik3ta32iplca4knuebl7/80065238727.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/totogeledagun.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/t8352rh39gk1up0apvnko1o273/38287115053.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/86670842359.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160fe296a4afd6---xisunofuruxidas.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/9723876929.pdfIn PDF document text
    • http://primaneighbors.com/userimages/diposujirumekox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=prayer+your+foundation+for+success+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_off0000c982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 10780 bytes
SHA-256: 106843d81b338637e5251eedab85e918d20eb806f8fb2324437fb26e42b2c1fd
font_02_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 16480 bytes
SHA-256: 185fe6014e0c5363c1769fe9245f61e5f4284deb1438f2ad497a3512c51bb2fb