Malicious PDF — malware analysis report

Static analysis result for SHA-256 24685d23a6e280c3…

MALICIOUS

PDF

103.8 KB Created: 2021-07-07 13:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b80fd28c05704db94f7929dacffc7c97 SHA-1: 841821b06c6d5900668fa667bb6b023aefe65c7a SHA-256: 24685d23a6e280c3873eef2eaaf64004ee9a91ddf8349159504a7df30d0505b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 https://irlanc.ru/uplcv?utm_term=how+to+get+scyther+in+pokemon+emerald PDF link annotation
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16089d851511bd---felome.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b8a1b400832e0148c130b44b0a08c7d4/nazujekebaduk.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/80f85fa7e835cb7fb4386fa4d8f8b83c/mirupakaxibogoxotubi.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f39b0992fa---61274396816.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/duwesawetugi.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d92c8c17ff3---vizunepisal.pdfIn PDF document text
    • http://fittbike.hu/files/file/98135158779.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/guzitoxabejasa.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ov228ijcm3f6lphekt6pf39ni0/momitodirajanazinex.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/875epcgbeorag27uovr0r5aq27/xipegekugumerinu.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/56505414647.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8o2s9hcm1np9lm8lf5of9vqccd/lanuxubitulemalatiz.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/timefesukudasizenovedo.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aebe22eeb3e---23723699664.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/9b1b066c2282658d708709e35bc16b48/51002790117.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/fka0i4qohchspr9l4a74k2jp65/xaduvegomu.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/5936883550.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086862d00e10---98794527731.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8c7a9a6cb863949122b956686387b74d/9631890568.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b98d99373---36897586757.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/15904019054.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945073ca92f---gobaw.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/4868316255.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_off000132cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CC 11244 bytes
SHA-256: eadd62dc4731c7ddc01eaa5afd98fac8ca2eabfb15452d94ca87d1bb31010b55
font_01_sfnt_off00014cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC7 18172 bytes
SHA-256: b22892b9e6666bfe3d4a1c104dabd980d970f05cdfe3e9f5d3f399c8e35ba905
font_02_sfnt_off00017a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1