Malicious PDF — malware analysis report

Static analysis result for SHA-256 beab024b86ac08ca…

MALICIOUS

PDF

99.2 KB Created: 2021-06-30 22:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 37d5765e49e6c240d4495637708d9b29 SHA-1: 73abdd4e09f519a06afd79a7fbcbc8334633d208 SHA-256: beab024b86ac08ca020846518d89260a035fbe26706d038b8c74eadb5709c70b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9862

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://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/69398897250.pdf In PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/29a59b007c8f12a9bea2752e9d39ebf7/7678750018.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081171996764---gulikokaxun.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160af8340ba9ca---xujolaxefosifapezupow.pdfIn PDF document text
    • http://vangphugia.com/userfiles/file/maxad.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/4487b7b8c6621d55e9e006aa996914be/37625336028.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b329985023c---83945586054.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/20309038502.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621333893.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb5de3636f---zibasiw.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1fjgcva2e1876c6l9pnfh5901/bikepuzubur.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607db36880f9d---28906778823.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/naxokawaravezonixetudir.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/rl7aqgar1aqvo6s3cvbeg17rlt/70322525327.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/59424638575.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/lmm3t2g5g2l60cthsbg1o1ns8e/47631111671.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/92127031329.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ac39f582---79747109598.pdfIn PDF document text
    • https://digireg.dk/upload/97644916301.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0dd774c71---80598509533.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607395430ce95---likoxafubizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=meaning+of+sound+barrierPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f710.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF710 18816 bytes
SHA-256: 445f30356281ef8f12a6567f164ae1ad4167b29fa2860d0e53b125348d298bfc
font_00_sfnt_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_02_sfnt_off00011655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E67 22468 bytes
SHA-256: 5f2b28b70bddb33bf9d46018fcef8d374ce598b47a270442a516a0ec23b928f7
font_04_sfnt_off00016513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16513 10616 bytes
SHA-256: f741692d1979135429a53b65b201b45b7c259f143229247c5f982bc2990725b7

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