Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab031adc65cf9c6…

MALICIOUS

PDF

73.8 KB Created: 2021-09-08 19:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7c5fe6d52d9709319849bc844394a30 SHA-1: 0fa974e70275866684e006cfd9408c88343ac37f SHA-256: 1ab031adc65cf9c623de4ad1a3189a7a76aba440ad7ffbd6a70f54401d3703f1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://degardo.hollandpazsit.hu/ckfinder/userfiles/files/duwidotalututilixedusexax.pdf In PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/19330714631.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/riremov.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/fixivisadosu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613081a866ee5---25096530322.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/60252189518.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/59192561628.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/rosedetepomudopi.pdfIn PDF document text
    • http://prestopc.it/upload/file/gipugixawipix.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbd71507b---sekutuzigegijimutavox.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/bixegofitob.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/82798277418.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/nafakuzisotipenozalon.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/jegevevopalusurudokugo.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/26944854552.pdfIn PDF document text
    • http://m2m2design.com/userfiles/71223157321.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3371443895.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/lanurexe.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/v8ldkr6v05mm3phv7bk90is5o7/mujidojowu.pdfIn PDF document text
    • https://tigapilar.com/upload/files/37767127247.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/15648036888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=invensys+thermostat+9715i+manualPDF 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_off0000bb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8D 11008 bytes
SHA-256: 39d37dfe7d2c3d5abfa7d4cd7fe19c2c64401499b8e9854274e8fa963159158c
font_01_sfnt_off0000d51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 17004 bytes
SHA-256: 790c0ef621e613f61a857382ddee2bd6c5c9b174f391a2a78959b2d2a726c3f2
font_02_sfnt_off0001004a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1