Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35149d25d5d8caf…

MALICIOUS

PDF

91.2 KB Created: 2021-09-02 06:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f98c63231b0068f9113b3dee0f23882f SHA-1: 874709289d81bfa3e0a7f7afcd463b1fe3a38dff SHA-256: f35149d25d5d8caf663839913328a7588d0328cf0bce5e233ac642830b0f8b36
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the links point towards an attempt to download further malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=emom+barbell+workouts PDF link annotation
    • http://giprozdraw.ru/ckfinder/userfiles/files/3434509155.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/zoziwerazoxaw.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba15728a86a---fewitor.pdfIn PDF document text
    • http://labonscafe.com/userfiles/93492760885.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/7dc34a63cb1efbc9b83bdf8fb26de903/xedijidekakaf.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/4185793928.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/78360352157.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/77496013830.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/zobemidivejoz.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/12115048431.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/wabolozafonawa.pdfIn PDF document text
    • http://yilip.net/userData/board/file/45847074180.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/witomevifebaliz.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/49b118e91187f0dbe7747d1e5c6986c6/zovoralitireteri.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/48997513569.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3587de58ab8584b6703e156ecc705090/78690918269.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/jokigebuzo.pdfIn PDF document text
    • https://subded.org/userfiles/file/kuzitetasafudubalarub.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/tutujetuvigor.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/59485586871.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/d3d37640f52b6ce38fa95c76d4d3c67e/redeginusam.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb0a1b7198---22598518938.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_off0000fec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC3 10472 bytes
SHA-256: f245ea0c93dd70ca3d64b95cb463153f7736c7cdb3c107f5036337eff870865f
font_01_sfnt_off000116ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AC 18688 bytes
SHA-256: 163d4a0fa91e08d7b3053531a4e768220a2f5cb0ac51968a3bdfacb4b2ff32c2
font_02_sfnt_off00014771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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