Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cab44a72e86ff7…

MALICIOUS

PDF

89.9 KB Created: 2021-07-13 01:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e757816f42e698bf2c0921560662f645 SHA-1: 5732b691975e60a9c7e57605be5d1baace1c694d SHA-256: b1cab44a72e86ff7bbcf894a3c47111fd724cf8d3584ce824017709b954ba646
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://cuspsurgeons.com/userfiles/file/votixebofajaromerade.pdf In PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb028d5ded2---68318999046.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/48581501048.pdfIn PDF document text
    • http://bomtvcloud.com/data/board/file/20210513190852.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abab1309761---tutorumebobakunigenefi.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/97819074079.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c689d9b3522---42572516337.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ngj1r10v8pg1qumlfbhm7brsv0/tozedinitegogosew.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953e9d7914f---dekifuvizexixedegejo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a5eab601---56038019768.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lnmbg29gob443qq7j9r1vk0b10/fafawotiliwipet.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/821b29911c7eb1c27cb02ec6ce5c084a/lujomugo.pdfIn PDF document text
    • https://wecareprogram.org/images/file/39867728882.pdfIn PDF document text
    • https://fultoys.com/userfiles/62545332553.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/86172987591.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/tmdld6ulrvstqab9b7e04pt744/sikisibajusegag.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/55154714317.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/78284349912.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/87658217792.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0965657acb---pogujurulabamizexu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/toi60reom6eq6miadup993oi96/nezewimoba.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/9691026761.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/460255b5ed5167a3fa383d226a65bf8c/girarolabuzixobumepopoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=fainting+on+seeing+bloodPDF 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_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 10440 bytes
SHA-256: 97df64b2816a9033afb74073740fd0e595a21b742ead557bc5a9bd5393977f6d
font_01_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 17316 bytes
SHA-256: 3d4fd1690f7393d994ffda1522ee3429bdca9a3c061516e43472614aceeec800
font_02_sfnt_off0001428e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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