Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3510c1bad365033…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 20:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 301725b55e1d5c20fd39bc42f6fb0b1c SHA-1: ab13840605f24ae2b6a25bed507b544e282b8f65 SHA-256: a3510c1bad365033427fefc489d6ef2ec99084cedecf8306fb7a1feb1b3a7012
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of a 'utm_term' parameter in one URL further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=play+among+us+free+online+no+download PDF link annotation
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/96144999da9c2e81a856c5462e8e922f/78160073039.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/gazijinekoxiropuj.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/45221624504.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377c00c91f7---96353635822.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hsupo88qftk1hss7a6mdtjptm2/mijolumibu.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/32755026303.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/65915556146.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/20249139089.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/97136058466.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/92508920541.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bba415cfa3d78ac169c264110a3bca8/biwibimujatejezirazitude.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/3517365318.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/91449769647.pdfIn PDF document text
    • http://saint-party.com/media/file/tigeraxenemume.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/54434694359.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/56796255134.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_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 10900 bytes
SHA-256: fdf02c2a64c444e9d5146865316a7b396bf55c67ed4c3f636a67343949d88a93
font_01_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 17028 bytes
SHA-256: 53aefc46246d9cfeacf1fc318a6d865fc69288877849d435b41a0bfca047ae2d

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