Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1370505b493191f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-24 03:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d9539b676cf431fbde6e236181a5d7d3 SHA-1: 7d27004c050edef6b21f67b0a5baf6d28152b49f SHA-256: a1370505b493191fc567ccf37fe5af00f09373a39efecc1f0acd912ce31b389d
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised CMS platforms. The presence of multiple PDF-specific heuristics related to URI and link farms supports this attack pattern. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://mstreatmentadvances.com/userfiles/files/40894024702.pdf In PDF document text
    • http://tiszaikaland.hu/upload/file/bexidolujirinalexezilefa.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/43465297480.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/12624186873.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/26965126897.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/wanajomolanaxadu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c59270ff2de395f9c3828a52920cad4c/sunumesokixosup.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/wijur.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/sugokipojililanupivaxode.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/97319052388.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/19036510717.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161461d39cca83---kexedi.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tojar.pdfIn PDF document text
    • https://people11people.com/uploads/File/73516622490.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/kibegipesaju.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/vokatujijixibujowi.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/jemedujububefazutupov.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/19369791092.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/nafuxumesiro.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614009f37b144---dadufiziwabexokudisi.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161315a8a36402---40128577710.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b7f97d70---gakalelerosopix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=stick+war+unblocked+hackedPDF 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_off0000c223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC223 10792 bytes
SHA-256: d128397f312708a379f23678be9046db21b4a52d775fbb55dd83952b026f8488
font_01_sfnt_off0000dafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 17740 bytes
SHA-256: 4a5a2daceb758ed68d55ac1dbfe41d3c5f32c07996c9e3afc8736eca5a881721

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