Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3d3f68de848dd6…

MALICIOUS

PDF

84.7 KB Created: 2021-06-28 17:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78cadb790e24662cf9058ac6060767a2 SHA-1: 8deb5eaffd7ff7ee2cf86bceb6c2f23ba6d4ca42 SHA-256: 1a3d3f68de848dd6221ea24875d183573eab5c1689745d03dbfe71a6318dfa74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the extensive link farm is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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=introduction+to+environmental+engineering+and+science+third+edition+pdf
    • http://www.dean-cpa.com/files/adminpic/file/nababo.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98004d43e4---bimed.pdf
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607262a99a6b8---surojezirefofuredugide.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/71f54edeb94a1ef9fb9bd8ba11ee4709/18123946398.pdf
    • http://airshow-bg.com/file/46129187940.pdf
    • http://aircond.md/upload_fck/file/buvafejesipuxemifu.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075967610c91---fagekixiseporu.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/e391b3fda0df7a64cc5dd9368cc02a8e/xevagakadedovigax.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c49e74ccb91---29654016562.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c94bd7da---88260034067.pdf
    • https://arrayamed.com/userfiles/file/61771443961.pdf
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/10148900089.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c0fa99f8a386facd58231e8dde36fe32/82945479748.pdf
    • https://stef-nancy.fr/upload/document/47287262206.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/k692nbhsgh72gosp1lc9ktfjf1/45587472761.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609459b2ea132---ninevonoxe.pdf
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/fokikire.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/d60ef3ccdba42ccf380ebfabbcf0cdcc/44592501746.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lumumomaka.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3056535eb---74972548047.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/8f6b9b037142c0c086c3fa660744da8b/70185439504.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/12c3583c644d42cadb4e77e58c18e310/74482805677.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9677852221923316fa9be415aabbe48d/rokebobawuwigapemimove.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a9180961---58251244042.pdf
    • http://angelescare.com/userfiles/file/45601816752.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607777e713e52---xepovid.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ab.bin
12d1fbfbecfac04d656a3ab1951462e413b3bb62ac705ead15bb33f558046840
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 17408 bytes
font_01_sfnt_off000112a9.bin
d6c883c9145192d8f92a423740f796921087575d13732a33199a8d3bc435c209
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A9 11184 bytes
font_02_sfnt_off00012c76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C76 16792 bytes