Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbc7781e15549a9…

MALICIOUS

PDF

85.4 KB Created: 2021-07-14 06:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f972356b9c52b6f533769b789b0a20e SHA-1: c613b49af74bf45f8e51dbfa2becdd9962e6f58a SHA-256: 6cbc7781e15549a926645fac78b70b7e46b9e63b46593986169471a3335d54ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=how+to+put+two+pdf+files+together PDF link annotation
    • http://gancza.pl/userfiles/file/87938643413.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/27d09cc0e4b48f2672dec65408945bee/70749613864.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/c9lou26lobk5q8vassjtvjishc/fenojegukobipot.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/qbrp4nf5p2b44eenfcfs9fgfcq/73244109550.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/96412619608.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab3a411c7d---34624218242.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b2ecb6676---30754314626.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c491162dba9c49d5be9d9029e2fe8c2f/40789467117.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/39072163419.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde3492f10f---pijabonedikigikavim.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/3194770377.pdfIn PDF document text
    • http://vodnik48.ru/content/file/sowupimoxowuno.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/deebb17129968ef5b73942efbe15ac24/kokeduxovajunuzakebe.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/96982328646.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/34537736897.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b22a46e0388---60562176224.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/444919017.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/xenobukivixilusadakoxu.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/20218165795.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/31139909467.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/dovutupote.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8900adb66---46971663499.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/foxewigezirugiget.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 16772 bytes
SHA-256: 777edd78c428b9bbd6b8eb72556ea7d9ad9e05e1d7276ec41cf6a652598090af
font_01_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD2 10688 bytes
SHA-256: 3438324698557f96754af329357456a8be7866d232ff2f4487606d855fd64ee2

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