Malicious PDF — malware analysis report

Static analysis result for SHA-256 70cc58066d1922c8…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 00:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2ae8a6e5e8e570df6be9fa392569c703 SHA-1: 2ac802fee5920b8ae137603fc2d6eb9d31607736 SHA-256: 70cc58066d1922c8529f425f16fbb5c36e7a359ccd3162b4ec06a2943a7cbaff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cef54d7f7---rejivibosiduru.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16106fb5776e68---34978697723.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2aeba9ae5a---75485955454.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/9fre7fa3gjbo9keke3qrs5usnm/lewidiwujekifutaris.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/24832825269.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/c2554c91c0c58fc60b4ecc7d4857b8c2/wezofazepavezolenux.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/l4967r5a0sqihf6odctl51kjdl/finaxatugikofesiripubam.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1ab174a44---98329909303.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/39128688313.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/debowuleniweluro.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608507911feb3---24312693228.pdfIn PDF document text
    • https://tekmaker.com/upload/files/34681891387.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096479d51c66---20478923622.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/ginufeg.pdfIn PDF document text
    • http://webbuilders.com/files/file/gelizuwazatu.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/63326283394.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/90909598598.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae676c8c9b---wilopetotu.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/95852005652.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16092fb2399f8c---vuderorulofunupixupove.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210611091536853.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/50820659065.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/94189438257.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a22ead01a---kudusotilenakitezibafupel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=welding+symbol+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_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 10728 bytes
SHA-256: 5c36b832ce48a8f11336af8206964254180495574357a7e3ea0e6fcd3bd10f03
font_02_sfnt_off00011206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11206 18020 bytes
SHA-256: 362ea00c01c2813617d92cb201c69842ea0d8665e12a29a7b01410e158d3b814

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