Malicious PDF — malware analysis report

Static analysis result for SHA-256 3834aed00403e2b5…

MALICIOUS

PDF

112.5 KB Created: 2021-09-02 17:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9427eaedcc438ae872fb3a2c0a7d4129 SHA-1: ce2a1367271ad8a94baf4a4f4902240a895f0896 SHA-256: 3834aed00403e2b5765aea987bc26ac0e9939b8fdd86375ad9269d1818089a70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://pronobile.de/catalog/file/67550527068.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/395d4311b80a8317bbfa7c114091ae7e/23444458385.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/1a3ef047b2bc2e9ff5cbbb05d2770c1b/mexurutodivabutos.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/vazazezejidali.pdfIn PDF document text
    • http://ruresept.ru/files/file/9324976043.pdfIn PDF document text
    • http://dytac.hk/userfiles/56805544465.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/65568128187.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/10720632681.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/bizudiwotidujanupata.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e651567d9bf90acb6cf667ba34780f65/51058755033.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/28/file/20210528_014403_156.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a46301269---3138239264.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/48099357576.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/nogunuvafiseduze.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/jujolabelitukawomife.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/a3bbdd37a6d345ee51239eb14abc0fd0/63921843231.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/37047542800.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/86017976452.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/dulavibe.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/lusagedategixabigagomono.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73a037389---gogitonenetugopavuvez.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/vazumatokoxerodepozunomib.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/654cf261edab893e19522c2c0c2a27e3/38453530691.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/73baeaef423047f3e19239c937744a77/31248185052.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/bevuparemuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hs+code+list+pdf+2017PDF link annotation
    • 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_off00015315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15315 10580 bytes
SHA-256: 5633e92c65cd8fad1b423196e8bca44cc42604da57eb3d2e99a4dd74c81f93ea
font_01_sfnt_off00016b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001837a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1837A 19200 bytes
SHA-256: 885fee08807332050718440e9de6355afe514202e660698a899e68d932091fd0

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