Malicious PDF — malware analysis report

Static analysis result for SHA-256 761cfd5cbc5c3109…

MALICIOUS

PDF

95.4 KB Created: 2021-07-14 06:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d93ad211a62c898c76a66fe43715c276 SHA-1: e51b4bce80593897218e3bd7f794ce0ce1c7bfb8 SHA-256: 761cfd5cbc5c3109007ad790d31df9bb03112f3769595a9971af8c60be34c9b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings suggest the document's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=critique+of+everyday+life PDF link annotation
    • https://atphp.ch/userfiles/file/fidozuramixiga.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/go1jn23ghpt5j31oqf0lg1q8q4/34391374595.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607062bb7d32e---gojijeko.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/88867927012.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b02ce2a0b27---zesovaxabuzejabetapabodur.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/nadulon.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/32087085613.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/bujuzitanofi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pudup.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/wapenafedutuw.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695b794873---15293718037.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/91734724858.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/woxesalufikaminaxoruvuje.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/76688400473.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/sosoz.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/75082141321.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b22443bc13e---mowosegumu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4c9e44f16---lekegefavop.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/74968828712.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e6f3650f02b9fd824cf436cf0f511c1f/34188614455.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/88770854873.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/fasobifojusemofodutisujez.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/3ba25bff46d8db27d5889b6779db620c/dadel.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_off000113d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D0 10532 bytes
SHA-256: b8a7d036cbfbaf3e6d9a3addfbb09b351bddf13cb33fdc43cdcdfbc59c4c8826
font_01_sfnt_off00012bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 17140 bytes
SHA-256: 8816563a35cda9c733c8835559031fd458e434e64326b014f1850aec72dd2305
font_02_sfnt_off0001586c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1586C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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