Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2c6a37ab21ea7d…

MALICIOUS

PDF

69.0 KB Created: 2021-09-30 10:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a9313b5d97c89381a0890fc8393e9599 SHA-1: 5d3034e08f9a1a06db0bf72339ee5d25c11c8a2f SHA-256: 3b2c6a37ab21ea7d692844d78a1d376b500c3ef55624e0420eb29f2b2f1d1793
156 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a link to a compromised WordPress upload directory further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://www.bmo-agencement.fr/ckfinder/userfiles/files/sejepolanofenepino.pdf In PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/vutaz.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/rupewokonipebavumosegole.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109151008042201.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16153ecc12768e---vugenejotevutewutijo.pdfIn PDF document text
    • https://kmedebiyatgunleri.com/ckfinder/userfiles/files/naxijamorudilivotezu.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/bimaxoramalitadobiv.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/23487533847.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/ditatuduvukekof.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/17428884689.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/439372c2429fe65a262112f735a17aa9/61576028488.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/tefesazebibejozitumo.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/39619480831.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/pefalogepifovef.pdfIn PDF document text
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/95966480583.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/pumexagitisawigumasaw.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/wataxijorutinuk.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/pavupitek.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/7447809627.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/rirugekivano.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e394a237a7---kabirewebufubuvivel.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/xijojizusatopafetewobaf.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/wopodesameguzagines.pdfIn PDF document text
    • http://benetalent.com/upload/files/8239583813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+collection+apkPDF 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_off0000afac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BE 15012 bytes
SHA-256: ebb7d738377cccf24deb4ff0c1c639b72b4cb17930f5fbb0e24e66512f4b0fe1
font_02_sfnt_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 10360 bytes
SHA-256: ff1b2e061eae628f1251cb4a0f166aa170485c4ed7b13b449d88ea3866fcb711