Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb74c161db36829…

MALICIOUS

PDF

91.7 KB Created: 2021-08-06 16:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3acf83de070f02478b6ce4a7e8d9c504 SHA-1: 0a5e1679099fa591e7d25a8d87da59a106ff9880 SHA-256: 0cb74c161db36829025839e596c39e81641f8e13c5314b50ee800c695c113dcc
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it is used to redirect users to malicious sites. No scripts were extracted, but the structure and URL findings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://sonhanint.com/uploadpic/sun/files/202108060909012169.pdf In PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2cmeemd2fvp3c8hiokv0t5c323/74598778600.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/53821562932.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/pivelakomuvuwikipabebek.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/56278749202.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/38244764949.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/41886591217.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160762a28980dc---40053739690.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/segugole.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/er1c8u35qk794ctr4ipb588d11/78789281942.pdfIn PDF document text
    • http://raczcsalad.hu/files/65366308858.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2446f47790---tebov.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b14c6265a---66538967979.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/42532652498.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/24362255685.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/difudikuteketobamedezupi.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5a65d3b231034b4e3442e01c83c7bcad/xifurapozapewamigunoxuxi.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607304e04f7a0---95240321596.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/nulewogeseterijabetomowox.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/kebapawejozufunaj.pdfIn PDF document text
    • http://elitvorota.ru/f/file/42403209323.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210609230123.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/78917211470.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gasux.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711f68191fe---fopugunaruv.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/47629795087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+to+eat+on+phase+1+of+hcg+dietPDF 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_off0001022e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 10796 bytes
SHA-256: 4e17af88135f0fafb6c4ebd929372cfda7955aa5ed3da64d7b545958fcf0b7e9
font_01_sfnt_off00011ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE6 17208 bytes
SHA-256: 8e0bf38f1c31509f3d186bcbc620b27ac865b733c7bcff8846d93d42c55fad8b
font_02_sfnt_off000147e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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