Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a32667605a65804…

MALICIOUS

PDF

106.9 KB Created: 2021-07-03 19:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ebcee125b8d44d2de0a26952d7528b7f SHA-1: 7cf1bf674bb5c4eff5affed80d1a839fc62204c1 SHA-256: 0a32667605a658047cab50f582a7a48bd619e4d5ccf1fa67b9e545669efeb430
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine rankings or host phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=which+statement+is+correct+for+all+catalysts PDF link annotation
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/c210400c8c22431f60b72899a6839ff3/51946065869.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/925c75121e515478c25137634855d963/43048732019.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160748054763a9---lisojukalogisopedetadama.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210605035800.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/058c4ac430c71c6b98ea9e3138607a8f/lomaxujurid.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cce9792d8---xoranenifolotonemezunu.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/9221921326.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafeef0f462---nijafudediboloja.pdfIn PDF document text
    • https://amblamy.ee/upload/file/93237901170.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/goluronuka.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e95bbd1066---juguduvusovuwafifizixejaf.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b547b9d2c8a---midusagatulejijes.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/kuzit.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160783b8a7f80e---20066296116.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/menelebimalenenagave.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/ziwubabizelivazukozizulev.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e65441ff---26662099066.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bcca6adc43b---13737555134.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/54145935531.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083d7285ced1---gegaguvaxigatukeduzo.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/jiguxiwoxodinasive.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/65501937895.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/3221585e4cc5dbad00b7435891eabd86/jewikalipanejixudas.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bef9519c156---bumuzinuwemasivupafo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a85cc9ce469---41618199938.pdfIn PDF document text
    • 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_off0001380e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380E 10708 bytes
SHA-256: 5bba2404784c38281860fcdc7244aa34de21a03f370610f40a136824e776140e
font_01_sfnt_off0001507f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1507F 20656 bytes
SHA-256: b3a7458b3ddfb9e15ff092656a6df230b39ccb35d018450e1ab8d0abbbad300f
font_02_sfnt_off00018604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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