Malicious PDF — malware analysis report

Static analysis result for SHA-256 32310d0f44600b54…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 23:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a32773c154f9bee15e3469097a7b51ab SHA-1: a46f836dbeaa21ce3222bd18eb54ac4fb1f59586 SHA-256: 32310d0f44600b5403bc28fda02db0bde74463e0f686a603533058541f74d768
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of numerous links, including those with 'utm_term' parameters, suggests an attempt to drive traffic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=desert+storm+game+android PDF link annotation
    • http://8njl.com/userfiles/files/wukoj.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/bixazetuganolobunatu.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/l0iopuvjhbdu1te6b52pnh2bhh/sodesu.pdfIn PDF document text
    • http://lscapital.it/images/file/22119397767.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/nakivupom.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/romewogefaditumejakat.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ccc9848ee82130a68393a11d52f9f6cc/91286850698.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/47563727436.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/377722810.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-19/images/files/29115406587.pdfIn PDF document text
    • http://fteq.ru/files/file/lifevazinalinivotades.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/nubudamakikokunekarivek.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/10752605583.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/gewexawubivux.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/58857966835.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/19047267371.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/74979771413.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/zitobiromibesu.pdfIn PDF document text
    • http://czminghe.com/upload/files/71041986510.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ujne4q5q917nc543qs3el55af8/10911012137.pdfIn PDF document text
    • http://stl-hk.net/userfiles/pulatu.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/33583891624.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/tamogogetixokabegozo.pdfIn PDF document text
    • https://camphacement.vn/upload/files/sixularorewikosukigutozu.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_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 16992 bytes
SHA-256: 010fb3ef4eff8cdaf4b4397b35f5613f72fa569ab6518796e3e4975751eb82eb
font_01_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 10548 bytes
SHA-256: a3283a92aa9b818361215546a007cb6f08c40613341b4ad3445f18499ff5dda9
font_02_sfnt_off0001244a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1