Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1eaa31af8f2e514…

MALICIOUS

PDF

93.7 KB Created: 2021-07-08 06:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fb925e635e3d6eff7fac4906420408a5 SHA-1: 9892845b47094a8f5a07f22424509d481202ece6 SHA-256: d1eaa31af8f2e5142877d4dfec2f7c5c9eb640112d066197bdc84c24ca72e578
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a mix of compromised WordPress sites and disposable hosting domains, indicative of a link farm designed for phishing or malware distribution. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://krisoc.ru/uplcv?utm_term=company+law+project+pdf PDF link annotation
    • http://a-kamen.com/userfiles/file/mevid.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160716b48305c0---tonupiwow.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/52905945852.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/fumejuvutenabapore.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608abec9dc17e---27386257149.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/89816727836.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/oriluduz.pdfIn PDF document text
    • http://piecco.eu/upload/files/lagam.pdfIn PDF document text
    • http://fotossc.pl/_files/file/kutumerimamenadujelimum.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/20284608480.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/009baa0c47abde984ee9be2ce026e208/80791384766.pdfIn PDF document text
    • http://talleresjpg.es/img/file/mopekag.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/65390731761.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608396e362d91---17843972403.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/kuvaxonokowixizagur.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e05a58e1---wopakosenexu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741ff43c299---49165849923.pdfIn PDF document text
    • http://yejida.com/userfiles/file/xufabamopelokejesi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a3730a635---24184642186.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160993593c7c29---divevororamemujugadef.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/o8ltotdh7o5e60p2dr1ev4v1r3/duxewuvipomuketanigunif.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021051917412373499.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/74103500629.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/61006213709.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160da511e1542f---dajebozakabe.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_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EB 18004 bytes
SHA-256: 3b56fc79064d2b496e5a039b8a05ce65e255db1afa68fa919235c5803e935135
font_02_sfnt_off00015069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15069 10884 bytes
SHA-256: b9736d789eb2315ec9fff56650312f78b5932674a6f3a81c622b93d2526b8434

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