Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bd0d001217487b…

MALICIOUS

PDF

74.5 KB Created: 2021-09-25 08:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9170335247385106fc8abe0eceec5896 SHA-1: a776f3c204e2e0c977df8b9801465e607f98ed35 SHA-256: d1bd0d001217487b85bdf4311962f335cdd23c51c9245b737ba486dd462abacb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm on disposable hosting. The primary function appears to be redirecting users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=gta+n64+rom+download PDF link annotation
    • http://batterseataxi.com/survey/userfiles/files/votezonogisasojeziwux.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/mirokalasifa.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/sedugezimavajewozetif.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/96144999da9c2e81a856c5462e8e922f/78160073039.pdfIn PDF document text
    • http://www.xzass.org/ckfinder/userfiles/files/gogunelodumivizoduxazeva.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/94853338606.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/xeludubad.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210902132520696564ra6rpw7wi87y.pdfIn PDF document text
    • https://steammining.com/userfiles/file/67892670187.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/samomul.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/9239386094.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/tusexabijadilufol.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/06601a78210a5f6353fd3a24dce47ce3/lawis.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cq2hm2k0g691rk6pp9qqvmt7av/bovazotef.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/zoxafenojobunelelanubem.pdfIn PDF document text
    • http://crediramasrl.it/public/file/lowenuwotupojesuvota.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/48817108371.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/goforuniwogozes.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/86681039541.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/xajapufizabejewolefet.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/nanexenuninodo.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_off0000b514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB514 10388 bytes
SHA-256: 295c0101e28de2fa12b8560eb5ae4d7f8f2110f9602292ce838f3a22c2f8a5c9
font_01_sfnt_off0000ccbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 21904 bytes
SHA-256: 6e3cae94685dfe2ef017fdfb918ea08b434c0751c0937efebfccb5e8f1b92a6b