Malicious PDF — malware analysis report

Static analysis result for SHA-256 017dc9c74ba44fc5…

MALICIOUS

PDF

88.9 KB Created: 2021-09-17 23:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e5e971d6d160d373fae2925a83b6e44 SHA-1: 2e6d50987f1c88ae67c56ac21a319b017124141c SHA-256: 017dc9c74ba44fc52a270cd14d86fc042a5e917d638ca04a237a785571747873
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users into downloading further malicious content or submitting sensitive information.

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://coretry.ru/uplcv?utm_term=year+one+stream PDF link annotation
    • https://binarbaidservices.com/public_html/userfiles/file/7447665154.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613644b4cfc29---23874836451.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142d091d4d7e---nipulufupanogarazorem.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/21a2d925c30f01dddb84aba0360b3c12/13559098287.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/70114996535.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/88046229617.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/96300389738.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea468f51f---92395991011.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/55608505884.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/96572967076.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/91378905157.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b35a6297---74338893561.pdfIn PDF document text
    • https://kede.org/userfiles/file/72768453543.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/bakifovevumolakupibi.pdfIn PDF document text
    • https://casaalu.com/luutru/files/40706644797.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/72474796832.pdfIn PDF document text
    • http://bulmarconsult.com/files/bujezosulid.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/gudusonazeg.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/lemurazaparud.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e057dae0d---madilavujapovoze.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/dakumimumugu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135659119c26---32317468937.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4dd914bfc24b3fd4ba28e033c037afc8/rodukinuwedivebikilivurij.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_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 17368 bytes
SHA-256: 28502b29c6cd1e9715bc46f42b3ae2b3842f37b7dd14dbc4b0250674d1c51e93
font_01_sfnt_off0001279e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279E 10112 bytes
SHA-256: 65512084a50a0a10cc3d0ba1484f8e07dafaf70c02687603152cc01eac68a80f
font_02_sfnt_off00013e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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