Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a496ccd91212c28…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 02:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39267d09fadd5236faf90eb79226ca92 SHA-1: 7e3c04eca1759874f00140181f59690d546ce2b6 SHA-256: 1a496ccd91212c28a8671539b359432d63124fc9a2afc7a4d5216435ac556e03
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kristaldicarlo.com/userfiles/file/gudafisebotubugufu.pdf In PDF document text
    • http://pazarziraat.com/userfiles/file/67617068628.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/fewunusuwaforogowi.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/paxelag.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/6147841359.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/7227303113.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/jenurexezexan.pdfIn PDF document text
    • https://people11people.gr/uploads/File/kazitejegeninewonudel.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613906dea72fe---xukevofak.pdfIn PDF document text
    • http://aminotp.com/upload/files/48154288796.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210908233442067900zh9r0fy8bewp.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/54656351751.pdfIn PDF document text
    • https://majubesar.com/contents/files/14159112947.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324af8dc6e0---nikiremakekufedazeje.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/digufamokigakuko.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/bukefapabesopipotetopotes.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/jikoderi.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/22263242487.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/p9pubj18h8togi2rqjqcai72eg/24064889738.pdfIn PDF document text
    • http://gr-chem.com/upload/files/2480821323.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/8f071c381be1572f0323608ff906ccc4/96547429604.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ec6ad65f16a54eca7b9ce49d2ab48f36/30660234493.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/nejave.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/76450176581.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/84342197583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=dns+server+android+phonePDF link annotation
    • 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_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 17816 bytes
SHA-256: 789102453a30a30cfe523beae5dab731c2ac0863f9a3a635781c9c48bf4ea82c
font_01_sfnt_off0001164e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164E 10412 bytes
SHA-256: e1efb585c813b0c12363bbee54ad01e053ed8aae32e8e3209971dd4434879085
font_02_sfnt_off00012dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1