Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6761e209a131f2a…

MALICIOUS

PDF

74.2 KB Created: 2021-06-28 08:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56602dac51e2115286a3254e742ce151 SHA-1: 76a278be349caf6be5f239f242dfb8c8e117a03a SHA-256: a6761e209a131f2aecbae08b7d5b082318015bcd854dfc0b9162aab84c4f6801
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns that leverage social engineering lures like 'train ticket booking'. No scripts were extracted, but the extensive use of external URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=train+ticket+booking
    • https://fotofidelity.cz/userfiles/file/fuwixalepoxagewizenafadup.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c48f2460bf---vipuwivupiselem.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b635b228ce1---10211397505.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa8c4560e1---5649912542.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e0eb1e249e5a39d9ae42fa4199207a06/81199286130.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/db5b6b21f558ffde89fd69b009f5cb6a/48567346777.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/41019974924.pdf
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/6280133974.pdf
    • http://flagrant-desir.com/userfiles/file/4775620049.pdf
    • http://lacasedescaraibes.fr/file/8457269658.pdf
    • https://steklo-shik.ru/userfiles/file/dinajoso.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/6105e11b6ae8578336f875257b9456e3/xavijufomatel.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71ff2aae8a---xamunosoroxotitu.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/58hmt7ns8liuu19u86rv9e2f23/51027993925.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0464bd38ff---57010662278.pdf
    • https://alice-immo.com/userfiles/file/wiwevijelusenapemufozifos.pdf
    • https://bwawarszawa.pl/upload/file/80839551344.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cda9a7a03aa---97702763571.pdf
    • http://go-pxl.com/uploads/files/483255586.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/8193db9cc1f6ce11b88e73b68c59f0cc/gakumujazubote.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f8fb6bf4d---tutupor.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e72fc55b6e804559cd65841aee9e1ced/64590568459.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/10222522353.pdf
    • http://capital96.com/userfiles/file/5212272180.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7212aca92e---22995751244.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c18b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC18B 16792 bytes
font_01_sfnt_off0000d99d.bin
bbe1336f28fab40544e47a76b5aca1f2ac61afaba38e5c9bd7de0d04a1c73feb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 16388 bytes
font_02_sfnt_off000103fd.bin
81d07aaf1c205cce967a6c4e7738ae3ae503bb71abb7efaff4cb582d8ac50a5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 10388 bytes