Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3ea5d7d86d3537…

MALICIOUS

PDF

84.7 KB Created: 2021-07-15 09:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 491a0c0883a1ee696618609ac108103b SHA-1: 0219c795e18d7975e814efa371cbcda823c07a95 SHA-256: 3c3ea5d7d86d35371f02fb9143f83db38b12450261e73aa6c97cd7801c52c35c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL with 'utm_term=word+file+not+saved+how+to+recover' indicate a lure to trick users into clicking malicious links. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pistant.ru/uplcv?utm_term=word+file+not+saved+how+to+recover PDF link annotation
    • http://billedbutikken.dk/articlefiles/file/vegojululano.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ae52513b29d598c2aeab56b9b8b5af34/49067460671.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a6ae7bf9---24503996096.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3c9511bd---31082256089.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e9fbd0dd---totorozubokubuketo.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/37588870681.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/bebagofowezizo.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9935c756854aa39404bc5eb58afcc2bd/35996848932.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/serofizuxuxuzepusenofupaj.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/86986192869.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/11655020572.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704290c1190---rolojozolemadazuvux.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085955369818---46582813731.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7064d79610f8e667ea094c9b230a8dcb/48710385962.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8dadc8ca2---wifakenavivogijawe.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6af8622b0---20227430730.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/15007033348.pdfIn PDF document text
    • http://allycatering.com/userfiles/zazamekiwijavoba.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75d10ba5db---luwawomiroxufatumiv.pdfIn PDF document text
    • http://bonsaichik.ru/images_uploads/files/1876565924.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/8157090572.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/pr0nqhtaffjd3a2l03pnhdu534/8211560214.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/durenon.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/kiporepu.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a512f892---90993106152.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/nidolalarodinekemero.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/70985915244.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_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 10720 bytes
SHA-256: 99a1f11f270d387d54403a93f972a05ed1bd30b5251976677349621d123729f7
font_02_sfnt_off000119dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 17200 bytes
SHA-256: ca3e0cf4256ac6696bc5d291caba8eee181a9e845cd8a5809a5a10c39e5ef1b7