Malicious PDF — malware analysis report

Static analysis result for SHA-256 9070f3e3392becd0…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 07:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3b0d0f1f19b622962268cbc1e8efa6ba SHA-1: ab263ddc167a9cb95fc832d4731a34828b5e2aed SHA-256: 9070f3e3392becd0f6c6d4b5c9900f6a4c5932c0065b09d6006697395c7482be
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=use+expect+in+bash+script PDF link annotation
    • http://sapientgenerator.ru/files/userfiles/files/63463726315.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/68296854951.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/90534508671.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/lqdd4hdmj0phf4c7ns2l1tgpg5/68850181917.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b105d0ce686---pajotuvidupoludemuli.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/guluk.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ie1i6hbpiikl24mrf8s7mdlhk1/dupebosinepaxi.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c25a8b9438---74074148287.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/oiddmaasunuea07r5ksu5k7cik/xevisexagagesidagobuvoduk.pdfIn PDF document text
    • http://zubrcup.by/files/files/dexagiwiridenakubigopelo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0535187e1---18522627777.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/7050d1b4cb914cc1744d4b9c57480cfe/vepudolumi.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/vabunominavifufatekimu.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/nebigapej.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/20510304692.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/0a6ac9faab14a864a972241174cce063/susuwerituvuke.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/vozakix.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abb88042376---japogitavupitufugopin.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/0e6ad69b45d2a6eeca8e14e1a737be87/batodobivepofazuluxebi.pdfIn PDF document text
    • http://nessium.net/userfiles/file/37547859889.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/68021679582.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/pusikedovunuzelofov.pdfIn PDF document text
    • https://asiahijau.com/contents//files/monefujalepomozafeze.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0cc213871df28177f0616155c36207f1/sesevonabadazu.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a316acd2d25---57455905063.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_off0000c24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24C 10552 bytes
SHA-256: 3c62288dea70b026d87bb24e69fc2f65c7c651f67dda9910ead6af083ac02776
font_01_sfnt_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 20048 bytes
SHA-256: ef9c1522267086691ed05d70a4bd292eb40f4f4fb811ddda21b33b1c2a9aa1e5
font_02_sfnt_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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