Malicious PDF — malware analysis report

Static analysis result for SHA-256 776c3914bd990b7e…

MALICIOUS

PDF

91.4 KB Created: 2021-09-05 02:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 750f14d7e293dfa1b96cfe83b0a27435 SHA-1: 6904abe6829fe2772816a9a2acb9475a84bf322a SHA-256: 776c3914bd990b7eb8f32e7fe19490a43d1878ef9ef25db7cd5b1bb18cc07a25
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised CMS upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm is designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://teraval.cz/res/file/88072009555.pdf In PDF document text
    • https://planet-pvc.com/upload/files/wonobaxa.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/53224070449.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/44598960087.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/mimoxefivixu.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/roveluvipo.pdfIn PDF document text
    • http://ashioke.com/images/library/File/8492322165.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/40330407112.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/qo5ftfki0vjk9mdj834157s6mc/67476089506.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/77870004303.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/modutalebasodi.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5bad1a4ed---62163964659.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be184258882---gunowapotijajo.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/91429234706.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/binutoxotusefedijarow.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a59ba2a9eb1a27e986802f31ff971404/94642340834.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/85602156233.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/40tfva9mvs86jcs2frjnjm8jqs/73370140774.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/terb23e2mnnqhle8qccgo2e8ci/40280787270.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/382d3d4b1c17ba8880b8d63ee6820200/vageje.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/233687593463e9fa452f7b19c31a813b/94887297369.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b9d8d97a72292b57f3c27ebfb8f9f4d/24452020890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=subtle+art+of+not+giving+a+f+pdf+redditPDF 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_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D3 20516 bytes
SHA-256: 5be628cb2d5d8fdac864104f1543789b5dcc7da222ec596abf6163cce9f580f7
font_02_sfnt_off0001474e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474E 10888 bytes
SHA-256: b328a722cefdedc95fb78722cb2575498ac380c8bb17711341b7e8565228e9d6

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