Malicious PDF — malware analysis report

Static analysis result for SHA-256 76abbd55db30cf82…

MALICIOUS

PDF

75.5 KB Created: 2021-09-14 19:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 804ed4346d4b52617fc7fe79b4f64f0d SHA-1: 5d847c43567066c28dd3cc47bfd905c513248ee9 SHA-256: 76abbd55db30cf821a5e35b2ac1df9d818e0f4041432aa3f4c9071851ea22a59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it functions as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://ageddfjtj.pretty-match.com/upload/files/kolepemovejuradovex.pdf In PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/kuniwixad.pdfIn PDF document text
    • http://parlagame.net/calisma2/files/uploads/gimosoxudije.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a31baa8cf8bbbe1cf0674ddbf5d31835/96511141818.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-13/20210913212635987096.pdfIn PDF document text
    • https://renteci.com/imagens/file/fuxifumoveribavejewavot.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/zanuwuvapikokinumewaf.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/fipurofovaw.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe7246a931---12873370309.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/nukamafagew.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/247937916fdcf2a3d1c08e4339a19f8f/64068027845.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/69702576025.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/maviwozoraretejerekidika.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c502c6478f---raxanebozoxefolafe.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/soletegopowodajop.pdfIn PDF document text
    • http://bushurov.ru/images/files/bidabanolidodemino.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c7abd7089385d8ce536c61d627817ade/jiwupinugilodijatimiwi.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/69564525488.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/numufajixijedinuruvazuxov.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/gokixuwopodizome.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8b37a5b50---4218367378.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/77871098993.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/20067570122.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/87879882172.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/2498302072.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/wogotike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=seo+keyword+plannerPDF 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_off0000c352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 17644 bytes
SHA-256: 3e9958981e1f3eaf17a018942f9ba422f0f8209bd5943cd76a8242227cb91cb3
font_02_sfnt_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 10396 bytes
SHA-256: 021553dc74e9ee23ce468eea6955b98a38270190a311e9459a568fdd4535b315