Malicious PDF — malware analysis report

Static analysis result for SHA-256 a407583c198965e8…

MALICIOUS

PDF

73.7 KB Created: 2021-09-03 05:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 53ddcca3cecb370bf7f9ce7f21c96d74 SHA-1: cf66805bdc6f0b4c8f24b3d034aec3873f55396b SHA-256: a407583c198965e8429c09a6f782f9a5e6c0f18b1bc85bd812ec7231ea46ab7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The ML classifier also strongly suggests maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely leveraging spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=manual+de+usuario+del+samsung+j2+prime PDF link annotation
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59394520585.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/30143469612.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fedf569f9---kowotoninijovi.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/zemananabizasuwe.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/9646589052.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a11c384a1---95813943240.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cada7b242e3da79abac977812d1dcb91/kaxarifezujopupirenipe.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/a8lb2n06mpf6saji29tv0t2te4/lafefepivovom.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b235e16a86---dituliligo.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/67s6ejscvsu1dqnimhgom598oo/98838261433.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/84510982622.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1474365619609374a39eb33.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/17a66f78d1dba9c286c2393e3b9899c6/50331749649.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb94ac97b---xosejotavagemi.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/efoxipibolobufufotabowiw.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/58949280490.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/zowobudevularepugetam.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/78575847974.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/22217022701.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/13013675273.pdfIn PDF document text
    • http://centronegozi.com/public/badon.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5976b41c3a---bunarisasopapilejaluve.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/97857147370ec45eb7aecce25e1bfe78/lomebexusitoniveju.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_off0000b9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD209 17368 bytes
SHA-256: 6ee41d38bad6a247d943397a1eab70ba3c8239022dd349b8ecf3c364feff8907
font_02_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 10980 bytes
SHA-256: cb6bbc210a232eed0b915028f3adee40810e139158aa69f011f69d3a2122ef55

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