Malicious PDF — malware analysis report

Static analysis result for SHA-256 429abe09a432df8b…

MALICIOUS

PDF

128.9 KB Created: 2021-09-08 06:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 9aafd95f6b1ff95bc9361e6ec0dd3861 SHA-1: 989788651140f981febcad0590f9d4c10668ed79 SHA-256: 429abe09a432df8be197ca8d4d43138090403784d416e0288b989e05ff5382cf
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=r%C3%A9gulation+de+la+tension+art%C3%A9rielle+pdf PDF link annotation
    • http://minuspk.ru/minuspk.ru/userfiles/file/20655119833.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/98662074225.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ba650d0559225c155971d65c659c5047/nupulovetawipofelapativi.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/32677063908e42adfa3d229c12924348/55905748263.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3ieb7g132o246tir59nm18muj3/raleko.pdfIn PDF document text
    • http://ccsl.asia/files/fotivagogupitikaro.pdfIn PDF document text
    • http://boxethai38.comupload/file/dabiwitinuwejubaxajam.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/2913635910.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/57766431695.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/37902580962.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/kitevexero.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2c1a7f7490637ffeb33887bab4758734/11119391645.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6930063c4d---12728116123.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/jasodeb.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/12392625153.pdfIn PDF document text
    • https://rajaunited.com/contents//files/nodanaduzexukamorusebujo.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/36710357796.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc639e72082---98927386696.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/e231q343vi75v47bc3cj3dk4q4/91131623145.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/filibiwozezirodexuxejaso.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607637c875c10---91545852266.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_off00018861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18861 22852 bytes
SHA-256: 05ae37ad4722408caef08c014760fba5108a08a626ca9298609b899c86db0759
font_01_sfnt_off0001c288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C288 10972 bytes
SHA-256: ff969e0529b03ab523d67ca15fd543a6b9d9824c0fff5fcf1c09a51b0a656d35
font_02_sfnt_off0001db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1