Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f3a96c6ef19379…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 10:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7084899138f579ea9cce50a075ebd36b SHA-1: 9def8112d5404af09a2c337c3bf9a21d9fe7b862 SHA-256: 88f3a96c6ef19379060dfbcc4fda82372b099efbaddce812ccba92aa1d564a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable domains, indicative of a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://matsonconstruction.net/userfiles/file/70387799921.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17f1695615---xinofitixitoliwoludibisi.pdf
    • http://kotolantopeni.cz/file/96916684154.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/04534af9fa20fa374ec028938fe1c9f3/vavojukomuzuv.pdf
    • https://aquafilling.com/userfiles/file/jiwesulidipezum.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c8c6f911---zevafuzedixebemagi.pdf
    • https://paklya.su/design/img/upload/file/41014056412.pdf
    • https://hamasataccessories.com/userfiles/files/58356014537.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfeb233eeec---49068062177.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/42f4ca9cd2139506e2de820191ef625d/60810346301.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a9975f43e52---1806435044.pdf
    • http://iltorg.ru/upload/file/33508479919.pdf
    • http://chrislahoda.ca/userfiles/file/zugopebe.pdf
    • https://najlepsze-w-polsce.pl/uploads/godajanakowobunumujivu.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e26e8f15a---xazelotojurofole.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0083b819be---39950422723.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sawosamuxuvitagodare.pdf
    • http://clear-es.net/yamituki-n/uploads/files/41157547076.pdf
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/23629632138.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef5ae09660---dosiwobotugilupuxadug.pdf
    • https://lanhcongnghiepthinhphat.com/upload/files/zegizowotipu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=foster+care+adoption+agencies
    • 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_off0000ef4d.bin
44dc1a26e0173d4b1df1996f60c1f63267a5be20bcc35afc8df299675339f989
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 10620 bytes
font_01_sfnt_off00010775.bin
3f87d5fcbb42acc4c8146a654b6558fadfc2136239a06ddcd259d9989bbb808a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 16968 bytes
font_02_sfnt_off000133a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133A3 16792 bytes