Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a82b31aa3fa1432…

MALICIOUS

PDF

110.3 KB Created: 2021-07-04 07:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0da2430afddfd2dbc1f92009b0751b93 SHA-1: 3120788f387c4d9264c0b91149e76d7a7622dcff SHA-256: 0a82b31aa3fa1432205ebf54b5fd42dcf210225356b6c0f85afa45c1de8ac53a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=vengeance+pvp+talents+shadowlands PDF link annotation
    • https://jodhpurtravels.com/nbloom/fckuploads/file/bajonisosorofu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6682ea69b4---93960405016.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e299613f4c---75329497137.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/52848946935.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2d7ce29eb---43830941186.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/vaximej.pdfIn PDF document text
    • http://hasyo.net/files/file/bubutosiramabawi.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/wepewuzenagaliwepo.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc1de370bb---gumusavusijutu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/q9c5eb0v76sj2g0661vqnugs2t/93956414924.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/29220263360.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ck7bjnot13tv7um8pt7rnc5k83/51557917399.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0b79435a5---regazokad.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a932feaf03f---wubipimalesuj.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/7424492274.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/cbc50fd0315053cb4233dbb19d1e9f51/tatanum.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/xoziwud.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ca31d3129---27432660049.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b27de777e60---rakuturofarixusewegazo.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7801653e9---kadilozaz.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j5ga3dh4jfaiop4ipqru6kag7f/kodogimeno.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/38664345795.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da00742a931---99506705316.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_off00014009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14009 10720 bytes
SHA-256: 564edcc3be40f05f4b917a8a12762ec25c28ae5c22e02db0105e0d2bca1172e6
font_01_sfnt_off0001587e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587E 23956 bytes
SHA-256: 0a287f218fd1be2462c5f14f403b2ffaefadcec71de9d9c6b1494ad7f856934a
font_02_sfnt_off000193f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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