Malicious PDF — malware analysis report

Static analysis result for SHA-256 916a6b55f3703099…

MALICIOUS

PDF

71.7 KB Created: 2021-09-30 10:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ded3604c3df78ad899792d35e01ece56 SHA-1: b0eb9da98f522bc09375919a6ec1dd537e1beae4 SHA-256: 916a6b55f3703099517d25f228d9a318019f74838adcf3cc77babd4271317be4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of external URIs and a link farm structure strongly suggests an attempt to exploit users via malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/gipowusepeparuzosa.pdf In PDF document text
    • https://dveropolis.ru/upload_picture/fijiwalazem.pdfIn PDF document text
    • http://come2menorca.com/images/file/fagabowe.pdfIn PDF document text
    • https://tele-video.ru/upload/files/vililubupinekapezuru.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/3ca81845493577f2c7c616a5130c304f/10395655122.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/20493957978.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/43778788385.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/15824201075.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/1870947014.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/sosifib.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/77084439261.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/88610196083.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141f43fb9654---46266994790.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/gijatorirevok.pdfIn PDF document text
    • https://evenements.gipso.org/ckfinder/userfiles/files/42033401987.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/92277111273.pdfIn PDF document text
    • http://synphabase.ch/upload/file/30787710468.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/fexabapi.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/molujef.pdfIn PDF document text
    • http://fabtur.ru/upload/files/tuvugeze.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16154074800fe4---20240721454.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/909cd57eafbd73ace07c5468fa88cc73/rikixipagirafirebobi.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/joxeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=outlook+account+sign+inPDF 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_off0000b408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1A 17900 bytes
SHA-256: e4aace99789555f565d4149061bb4a513e580eda2b5300c66d735e2918f78abf
font_02_sfnt_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 10392 bytes
SHA-256: 9a3a1ebd230c0ffd0109a95cd8ea177bcf55341540f9888021e88b46613679d3

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