Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5ebc9ceb1b5579…

MALICIOUS

PDF

116.2 KB Created: 2021-07-30 20:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0c8fbdd3f5f0f818abad929686bbf680 SHA-1: 52263da82c807cda30082ea96c66dd249c4fb966 SHA-256: 7d5ebc9ceb1b5579c0b31087735ffd4669f06316cbecd4d105b234d94dcce9dd
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are used for SEO poisoning or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://deurenhanger.nl/userfiles/file/31747283642.pdf In PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/eda56c0332f1f4ff17b2c359b5af2c83/bizubipibuwaledi.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/89514092094.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/319a2e4ac56b16b33d33be513c6ec176/zenikapuwajasif.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/pdlvn788e8slpid6jhqtan36ii/55104912254.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/bb21804b4206fc962c3892ec8359b757/weluzesupetefakagodabu.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607076b0bbefe---39697869991.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/dujot.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/lamazataluwivi.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa57a55fe---20349919028.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/durirefi.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/korukomewaporigipojes.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/gizejigasabij.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/14394568936.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/98554998212.pdfIn PDF document text
    • http://fedoro.ru/upload/file/takilenodozajotoxejuji.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0c478786461c79412fc8cb8632906462/pabojenepowuveg.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/16840119289.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/68468802374.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/76011991081.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c45ce8aae21---wuwafozonusonamufuluvulul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+use+nanostation+m2+as+wifi+routerPDF 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_off0001661f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1661F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E31 17056 bytes
SHA-256: 23a36b64ff35d378fe2b82e1d69f2de32ee27bb60556e99fa53018927e0c3ce3
font_02_sfnt_off0001aad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAD7 10628 bytes
SHA-256: ceac84a495a6a1cfee524c12d0fdee78a27f3836967b1455463482aa29997d96

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