Malicious PDF — malware analysis report

Static analysis result for SHA-256 405cc313680beaf3…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 22:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1acc25b2062279a1e456691b6de734f4 SHA-1: 897ebe51f51ca68a93e8de9e5f811bcb1484b4bd SHA-256: 405cc313680beaf38fec0f27881694f08b966f7a75741058ddfe4829d6ed8662
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. Heuristics suggest it's a phishing lure, and ClamAV detection confirms its malicious nature. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://smidgel.ru/uplcv?utm_term=android+ldap+authentication PDF link annotation
    • http://caopump.com/admin/userfiles/file/tilubad.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/dfda666ccaa9ab864bfea794818e5c73/56720211656.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/54632068387.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/029ed0797bd0200a13c87f968728d109/wufoxaloremilafi.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/9770009780.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/mipigegofesomak.pdfIn PDF document text
    • http://glttek.com/userfiles/file/99809716726.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/vewaferetebevepasozon.pdfIn PDF document text
    • https://telorgabus.com/contents/files/44946019991.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/70471544652.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/tubodaxafufeke.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/sefusiw.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/2341644317.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/23904482814.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/misagamexemorefufuk.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/9380305754.pdfIn PDF document text
    • https://clove7.com/userfiles/file/mazexepigolixakodomopazed.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/65418111065.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613456e68c0c9---vowutuwejumipenisib.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/19784007334.pdfIn PDF document text
    • http://grimastone.ru/files/63605157337.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/gapukozuwat.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_off0000e173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 18116 bytes
SHA-256: 438e64abc68250bef88b6151a5f726a235a067c2b6252664e580b22c63ac0f09
font_01_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001285a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285A 10524 bytes
SHA-256: d9f8f3157d1d12ebdc058bf39365cca9d427c9d489601c945bfde2349cbe8cfe