Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ffc73dd019ee73…

MALICIOUS

PDF

74.3 KB Created: 2021-09-19 14:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 441cb88be53341115f9bdd1a94a14823 SHA-1: e8e7607e024faedc5b4ca33f99e6ad06b2435ae0 SHA-256: 87ffc73dd019ee73309e75e1db8d48f620ae84ed4ea4def189c411d720f854b5
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on potentially compromised or disposable infrastructure. The presence of these links suggests an attempt to lure users to external sites for malicious purposes, such as phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://unsersohn.com/images/file/55806913028.pdf In PDF document text
    • http://dolphinkorea.com/files/files/50577605650.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/61939968361.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/21009866961.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/silukozisomawezumoj.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/30932395312.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/paridaw.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/76139883413.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/sugefosolimu.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/1537886886.pdfIn PDF document text
    • https://successalpha.team/upload/files/26689660170.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-19-14-48-00-ebbT6vkI.pdfIn PDF document text
    • http://rabwork.com/media/file/serogizov.pdfIn PDF document text
    • http://flomojapan.com/upload/files/lexage.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/27833878566.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/55476884241.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142376cbc644---54892119886.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/jigimo.pdfIn PDF document text
    • http://szm.hu/userfiles/file/vober.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109032259503787.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109180447461020.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/65847697734.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/31608359944.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6ba9930c---dolejugujaririkewomapawex.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/309d6641cf5c8ec7f46e45a510cad411/52773819660.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/soxokute.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/24858653860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=clash+of+clans+mod+apk+unlimited+everything+2021PDF 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_off0000bd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9A 11764 bytes
SHA-256: 4be3d91cddf67e2ff36e1c480fd4bebae7b5ded6da234d3e59f66b4cfe1f5457
font_01_sfnt_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 16256 bytes
SHA-256: a5ee40435f5d9038bda7184eb1b61745d83cd833b2917bbc0c25cabd15bd7c3f
font_02_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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