Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4611d47d6fea0d…

MALICIOUS

PDF

70.4 KB Created: 2021-09-05 15:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dd25dc68994b9db8631869f59c1d745 SHA-1: c882a950b3d82e5c4e81bec5e021d74d70c54639 SHA-256: db4611d47d6fea0d32888d998b18f5a849fbfeb906bcbba9ac0551e5f147938f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests a phishing or spam campaign aimed at driving traffic to specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=primavera+manual+pdf
    • http://billsky.ee/files/file/tipekunejagagiwawazaf.pdf
    • http://sashtraayurveda.com/ckfinder/userfiles/files/bubozonexur.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/6714c2711aa48a312b7d632c2b562796/31511925027.pdf
    • http://fatamorgana.fr/uploads/assets/file/punotapu.pdf
    • http://captaincook.hu/userfiles/file/72758486937.pdf
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/lanewolu.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/27luk6o7oi7dgtb2kog6731a54/bagozolerapomixan.pdf
    • http://wumag.pl/userfiles/file/zalesamenipid.pdf
    • http://fgosvo.ru/files/files/waverorufiriwalukobo.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094b767e02fd---72052668400.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f134428add---panudeninipi.pdf
    • https://cailux.lu/userfiles/files/bivebo.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f388075ce50---nebaluxux.pdf
    • http://mexxeopaint.com/upload/files/pojotuvafimonebesir.pdf
    • https://anmoul.com/userfiles/file/63288611245.pdf
    • http://salon-urody-bellis.pl/images/file/55179572473.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095af9d08f13---15739593610.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e778aa13e4b0dd8044bc6106a6d97ce9/sekakazavoxukexi.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0e39bddb2---favajukalilimipidefa.pdf
    • http://chanakol.com/ckfinder/userfiles/files/20251088187.pdf
    • http://absolutelyneon.com/userfiles/file/15433727588.pdf
    • http://kahsport.cz/userfiles/file/luveno.pdf
    • http://short-story.ru/upload/file/potafurevome.pdf
    • http://mnogonomerov.ru/uploads/file/87754478387.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607580c2bf333---37565579058.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b79c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB79C 16792 bytes
font_01_sfnt_off0000cfb3.bin
4ff0fe3d6034b28bd32cfc41384ffda4d731ccf55484cd666da2eeeea1b4a339
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB3 10440 bytes
font_02_sfnt_off0000e741.bin
f05bc356c81c2645e849dd0316811531477ed2b1ff1d9dd04f6f611d56f0213c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 14672 bytes