Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dec4d0acdc3908…

MALICIOUS

PDF

86.4 KB Created: 2021-09-03 14:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 228dd817336f1c8f839f629ba8e89d5e SHA-1: ccf420d38b0dbf7ae8ced22fdfbcb40627bcbfb3 SHA-256: a2dec4d0acdc39085c4c5d353e1298e2f065e69bc8b300ba75154fdcebf5501a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The presence of a link farm on disposable hosting and compromised CMS uploads suggests an effort to obscure the final malicious destination. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=amleto+shakespeare+pdf PDF link annotation
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160da6427d4f7e---72198722999.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/27657798607.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a6b6151cac---mofedeboxenuvijikupa.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021081323005773.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b651ed1038f---dizavuwupupofax.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/22384289764.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/faloz.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/20434006877.pdfIn PDF document text
    • http://salkim.com/userfiles/file/99772846441.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa2e0c9df9---44799577301.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/50127124183.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/kokude.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/bilizuro.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2dcd23814---zoteb.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/xunitokuzar.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/56652479146.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/72070518411.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c98aeec6f0---27493655010.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d97767f3627---wajajuvijepupig.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/luzolumexefesonevu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/warage.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafc86a3715---57378189026.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/wawokixewusowirobejuvo.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_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 10640 bytes
SHA-256: 303aac55b5c32428442d1ff5623e2cf49eb3d2fef0a84771e51ab11d64bb609b
font_01_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5E 18568 bytes
SHA-256: 9463373c5cb5a028080aec1d09935a4be2e5ab1c9b8aaba0674fefd813a73ff6

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