Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89c4115ec93dfd8…

MALICIOUS

PDF

89.4 KB Created: 2021-09-06 18:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51d02f799be6800ff0a907c4762ee4ce SHA-1: 245e075b43252af446a9bcd7e9c7d53282b813cf SHA-256: e89c4115ec93dfd80faafbe7f91ee7cb87b81cad7c0504952cedb8bb941069d5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.alcera.ca/userfiles/file/73158915761.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/lawavepesanonizowoxega.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/bofasegomuraxajesagadab.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sizajagipavamizitejipema.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/95871132165.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c309dd02c---gidufazexujo.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112b06f41ced---74268909189.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed5fe5d875---10479360139.pdf
    • http://lycee-elm.com/userfiles/file/gotipoxoxinide.pdf
    • https://alshaabcoop.com/userfiles/file/kadijo.pdf
    • http://contua.org/userfiles/file/gimujuwegedak.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c9076203af2---dakenajefinadupam.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/zagodivapoladitavobafuba.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/c1273dbc3a84b75332ae5b9ec95cd349/didigap.pdf
    • http://castrolmintabolt.hu/images/upload/file/movakovekigipasuwufojuvav.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c0f9fc10a469ce1401a2105f683e3bad/sezejopojinajifep.pdf
    • https://funbugs.ie/files/file/wedeg.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9b1e58bb0f6ba4be6c6325b3291b1ffb/25954013720.pdf
    • http://jp-cable.com/d/files/80565028089.pdf
    • https://travelworld.ro/userfiles/file/mipixerodezemiju.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/35b6pv2udqdif6lv4pg94hnl01/87568471415.pdf
    • https://akproauto.com/nbloom/fckuploads/file/27781400497.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607648ab7ff69---29541854378.pdf
    • http://letresorellebio.it/userfiles/files/mowidugazo.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/14680954116.pdf
    • http://busangh.com/attfile/fckimg/file///2021070621139_466653864.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=active+reading+book+1+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_off0000f43a.bin
b3c1771ce1712ced1f2d7152740ced6c892c31d5bf4e839f6bb13f205aed551f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 19916 bytes
font_01_sfnt_off00012749.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12749 16792 bytes
font_02_sfnt_off00013f60.bin
52c178e27387216a568ae39b9730320edc25c4ea38da90860d90c5799d7fb9c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F60 10912 bytes