Malicious PDF — malware analysis report

Static analysis result for SHA-256 216f2bb6a7ab03b7…

MALICIOUS

PDF

70.8 KB Created: 2021-09-03 02:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bcd8b06c770e533cb521615494a33962 SHA-1: b10f8530ea98d1f5bdc3b6d98ffab6aea1bc0d2b SHA-256: 216f2bb6a7ab03b781743195e9d06d765f21a39e4c4af739c69d0da03776bc91
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier strongly indicated maliciousness, and the presence of multiple link farms suggests an attempt to redirect users to potentially malicious content. The document body is heavily obfuscated and does not provide clear textual lures, but the overall structure and URL analysis point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://oniceh.ru/uplcv?utm_term=digital+transformation+playbook+pdf+download PDF link annotation
    • http://mya1fc.com/files/ckuploads/files/11824624706.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867bf67961c---5907764023.pdfIn PDF document text
    • https://wagaskar.com/media/70722848634.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827f56180d8---lapiburodinovunox.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160860966a8293---texiwabo.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/73072879274.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/mitoxar.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a07e797ef---zomibefovonesagewik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b03a9904b---giduzel.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/buwesodawuvijode.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7d1a81ff40056e63e618622bf0867cf4/subisovevoritowisebupozov.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/86671007047.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2ab0b8b36---divebenitidolobixewil.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/85464037407.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/13904772385.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160709533eb917---nubivogutuzonezobopu.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160791c39ee3be---63469565119.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2cf9003c---64671856369.pdfIn PDF document text
    • http://boxethai38.comupload/file/dukus.pdfIn PDF document text
    • http://contua.org/userfiles/file/dipodufegibaxex.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/6238501946.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/83467369089.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c9ecde1d5---fapakonam.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_off0000b5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D4 14996 bytes
SHA-256: 25c24b95db0f128a172a2413e079623dcd75edc64969c861b59faacd4a4db939
font_01_sfnt_off0000dbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC2 11144 bytes
SHA-256: 14320d2ad4fb5e5937571c33ac34c2a1290e1f5add2748cb1caf3c43d5eed487
font_02_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1