Malicious PDF — malware analysis report

Static analysis result for SHA-256 972100dd31709a5f…

MALICIOUS

PDF

88.8 KB Created: 2021-09-23 02:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca1e106e9e70985b68a729047085cd3b SHA-1: 7da679b9e212e6e3bb8413ffeb2e0626e4e1ef21 SHA-256: 972100dd31709a5f49cbf9fd4168e579cafe2fa75f3c76a1b888e249a4383c75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=top+ten+android+emulator PDF link annotation
    • http://narcisse.sk/editor_uploads/files/31481373282.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/96c64333fa12564353148d590f2778f9/nopuze.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/091019d2e208ccb9c359525c686f905b/lososejawerareri.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/fires.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/22739893051.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/rabijefazerij.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/88590042184.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614836f85d2e8---tejupowugadefadar.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16146df441a8ea---woxefepetodanol.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/41768802190.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duzupezozokonatovima.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/gm45s1f1op3nh0a7fmncaoqjd7/baxenewiv.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/71870296199.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/013808136dbde9609bf81b4bfca51a66/88828002144.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/62820000230.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/79599125183.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/14851094116.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/90274887.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/42417527254.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210910204458993.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/89647007632.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/82445370069.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/pixaboxokugasemebeniv.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16146c46248409---49833629661.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_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 17536 bytes
SHA-256: 262dc3b9d216f11ec233d4c49218f7bbca6f422ef3de7fa043157f99d9bc035e
font_02_sfnt_off00013dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD0 10448 bytes
SHA-256: 4ed170601fd41a3a89addf52e4abb88a1de649b513bdc83f7af922ac95d2924c

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