Malicious PDF — malware analysis report

Static analysis result for SHA-256 6751a931fdaf4ac2…

MALICIOUS

PDF

96.6 KB Created: 2021-07-27 07:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d458831f99cecd8bbd04519cfb399af6 SHA-1: 6ec52b339e2aa210598b15fc025eb45bee99fa50 SHA-256: 6751a931fdaf4ac2117307dd3581aab2ac01938d5123ee987f49a290a8e0a39d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous domains, many of which are either compromised or hosted on disposable infrastructure, suggesting a phishing or scam campaign. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://verkaufs-akademie.com/userfiles/file/96796983601.pdf In PDF document text
    • http://aitrans.org/UploadFile/file/F1202107171406159743.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096928c69041---20795017941.pdfIn PDF document text
    • https://migger.dk/userimages/file/zejobotimur.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c2baf0d3b786c0f49bb7e686d81065b4/54804430826.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f7b5d245ebbe7bcfd21cfc2fa48cfdac/pedubenavuwepakedekute.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b64e984580d17d5e9566ff93e1763349/dipodif.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/bonamexafu.pdfIn PDF document text
    • https://landbar.com/upload/files/piruruwitajigevi.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/4p4tvh47bdegfe4bibug8uojuj/8000837510.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/86002661779.pdfIn PDF document text
    • http://millecolori.it/images/file/57329892482.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160911096b3f98---mukonozi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160907e7488eed---37587325226.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be471bd2376---sofijirilenejak.pdfIn PDF document text
    • http://valeneighbors.com/userimages/56024291662.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/turakigorufego.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/80948820157.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/fevosojatemevub.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/rekisu.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160721c9114ca1---33156894815.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/c9n81g7i7b5pshilg3hqfpdgs1/fuzowikofewus.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/zamesezudodosuro.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3334168048---41331990207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+division+2+perk+guide+redditPDF 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_off000113b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B9 17828 bytes
SHA-256: 7eae6c6162ce8c145d37ba6a4f9b1b4892e835185ef13060607660ce27e45724
font_01_sfnt_off000142c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C0 10804 bytes
SHA-256: 4a2235a9f3d0313fb9e5d6e39c9835c11b690aea2a38545dbafe3d0a05b7732c
font_02_sfnt_off00015b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1