Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f081b81d1f5087…

MALICIOUS

PDF

109.6 KB Created: 2021-06-08 16:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7e3f5566a79c2ff82af584f076faaebf SHA-1: 4464655b271013f63c143a288096745855f35621 SHA-256: 96f081b81d1f5087eedf4fab8fe1a030688ebf364802353743526bb3a24116ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a phishing lure, indicated by numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or facilitate further compromise. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver secondary payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=halliday+10th+edition+solutions+%253B+50+%253B++%253B++%253B+Low+%253B+4 PDF link annotation
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/19df3bf737513020948a926d731114f4/suvenule.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f9a1b923ac84e19bc70735cfc3f44cd8/duzapox.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e41ca21f0e---45855036428.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/dojafegabewukizemefi.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d296a295b0220886c1efcd0cb219e156/vedaruxuxi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e6fe4e689---rukogakujuxata.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021052202300773499.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/040fbd0e40f6e14dcddc40ce593c82d0/vezinezatufireposud.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tiwaxoxaluvododopoz.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607005ad22753---majizux.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/et2fupl5i7f9t8p05qt6ubftnv/14027148319.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/901e7844f8edb552a7fc5bf129dc739f/40422851911.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hvd0c5pu03q6mk9qlo7fsg4ho6/datupikupaterotukekarovug.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ovo7ssomotu0vq599evds3cv6i/xulenogegawajas.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210522/file/27262459779.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.physics.smu.edu/rguarino/1308su2016/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AD 9536 bytes
SHA-256: 7d2de21ee6490af02cda56e31afbd1a581a35382324efd1cb958a9e1f942f79d
font_01_sfnt_off00016315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16315 5368 bytes
SHA-256: 4ac223a4b9abab928ecbf533624b55b1ac0068fb3bdd051e4af968b9d2cb405f
font_02_sfnt_off0001757c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1757C 10992 bytes
SHA-256: c2e076bbe3c5d0e21a295fe4e9a99528039ad2de367481cd6b3ef7b7eaf03192
font_03_sfnt_off00019acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ACF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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