Malicious PDF — malware analysis report

Static analysis result for SHA-256 881757410d73d3da…

MALICIOUS

PDF

91.2 KB Created: 2021-09-01 07:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2dc8cfd20aefd97d5bd46470e4c2e0c8 SHA-1: 30d4324dc2da2df792d634578558e576a3b0a2a0 SHA-256: 881757410d73d3da01f01383822f132426967c2dcc0607b2c02125eab0cae841
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 uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://wastran.ru/uplcv?utm_term=cecal+diverticulitis+signs+and+symptoms PDF link annotation
    • http://sartoriaventurini.com/userfiles/files/33719594446.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e91a4dbad7---xorexumibosorezozo.pdfIn PDF document text
    • https://digireg.pl/upload/pomenidokagatelefebo.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/suzefamudumibipinuvesevi.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/51dd27c1a7c19bf1dbadce1ca340a8c4/tokozasop.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/womevijofedi.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/tumilugefos.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/72525769042.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/54461641497.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/31117049233.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/9qfeuuioe0sr1vh00vmebp7or0/70988108894.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/vajigetiv.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/0d8d27604c8f85dcfae9c92b1153895f/lodosugomilalevunumubob.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/57776558772.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/sefuguvo.pdfIn PDF document text
    • http://deauville.ru/files/file/80888216914.pdfIn PDF document text
    • https://turismoporsantander.com/aym_image/files/nediberid.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/93696675385.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/1crn1kgljghaeteffu17qegpr1/gozepaba.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad64e5e51---ponivabemoguluwavuwodes.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/fipobobotuxij.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090071100d1a---41853968048.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_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 11168 bytes
SHA-256: 36acd1e32aa23d0887e3b3793c2404812135af400e3f40a4dfab736591458f42
font_02_sfnt_off00012f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7B 17768 bytes
SHA-256: afcbfaf9592f9b9aefbef3854502f4fe0d0905d6e298d4126e3373a265d7850d

Open this report in the interactive analyzer, or submit your own file for analysis.