Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c096552f000d1f…

MALICIOUS

PDF

86.5 KB Created: 2021-08-26 09:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27859d9f3e77ca49ba915bb1ae8d370f SHA-1: f5bccaa2d29a194b8212f1d301c8ea538559d258 SHA-256: 91c096552f000d1f0b44f6ab0af99b2dc07500a4a3498cb46e059b6e5cf6a868
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress upload directories. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://hocngoaingu123.com/upload/files/73908217087.pdf
    • https://warungmimpishio.com/contents//files/kemetod.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2857e5ae4---20935472136.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/mcp5lrfojq6q0t0m2c9v1h1h40/34317387072.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/68oobr8tk3boub6csup87geog8/tepakesoreke.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089d1ecec3c2---fewuxevupixigon.pdf
    • https://kanat.com/upload/ckfinder/files/wovigisoviw.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078709c32596---janekebemogud.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/92988340956.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5d3e56ad5bb70437cbe4ac9c7f0fa083/gajavinibomuviganusanut.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/fdikjmqemb66l67jd0qa4uf7vo/fizefetatijowilotagisital.pdf
    • http://isystem.hu/userfiles/file/vewiraraxaji.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff29f93a5e---90051055946.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612629be68604---41711805956.pdf
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/fepowegipipufozuboge.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/325515d60d9280cdcadef3552d529358/zunipixepoluw.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9655a9f9e63f6b61955d5c7091de0b40/74695878315.pdf
    • https://rivieresoceanie.com/ckfinder/userfiles/files/75471334590.pdf
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/tapeninuselotopoduwole.pdf
    • https://www.hippocratio.gr/ckfinder/userfiles/files/vamedulutowof.pdf
    • https://sogelec-eng.com/files/ckfinder/files/59634150302.pdf
    • https://www.aaptuk.org/ckfinder/userfiles/files/13528605184.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+open+pdf+in+webview
    • 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_off0000ee08.bin
0dfbaa7de4797bed464e3a0ffa54bd3cee8565f707e3b945c78738f5b87d0bae
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 17876 bytes
font_01_sfnt_off00011dac.bin
d29623ed672774f01296a3bd4b96eb155023b151ca94a2e758cdf195b26156a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAC 10292 bytes
font_02_sfnt_off000134ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134BA 16792 bytes