Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3300e4dd53c8540…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 08:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: efee39fea01b4e3dd593975d4f87dc07 SHA-1: cbf73ce7887a8b17e5ff180c6bffb5003431f5de SHA-256: a3300e4dd53c854022aec4dbf72037ca406b97e9a7fadcb50560846cd5d0f8b3
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves luring users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=cooking+frozen+clams PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gj3h0obb5chfkkfu4vjtopu9c6/dejipulefaduzesodexurowut.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bsf3vhfb9om5jbn0aernucvoji/66129401398.pdfIn PDF document text
    • http://gptools.net/userfiles/file/lemokefilepedinewakikerig.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/rakobunetidefaturejiwego.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/24913571038.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/wozolutadesuwetunavuxeku.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dbdc3dbdb---pufotatefuveverikusafojir.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/75673969236.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/wokolel.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65930a86e5---6120575658.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/d298a633de2f3017e18b7ad18fdf2966/durixox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0886b0fb1f---3892178606.pdfIn PDF document text
    • http://poliinc.com/upload/files/razajetoxakopetevexi.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/63328083161.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/zozoxeremebirojazijazika.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/fazawuzexezeva.pdfIn PDF document text
    • http://budka39.ru/files/36550678160.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97feb0bcd---83517900160.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/13016311645.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4f5857c09---lelowipe.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff74ca353---16942129464.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/25512121458.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/sixikaj.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/10907481782.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/79272437170.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/19364326956106c0a294ef9.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_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 10764 bytes
SHA-256: a42e85d8f73777ddaa1975fcaf4f1041e56ceb6e80e2d4ba971aacba4407bc06
font_01_sfnt_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 17224 bytes
SHA-256: 8ca68b525bff15d1a083e7e5849f685a2818543395fb136c9f6f7ecf83014dfe

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