Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b755ed255a422a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 17:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c836d0e47135ceef871fe1b16e51cacc SHA-1: f82a43ac4fe21b89361e8faf25b5ec739e34a57d SHA-256: 78b755ed255a422a0f09dce1430cfadf36dbefdaf33a00bb91876f0ce22371fe
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites. Some of these URLs are hosted on compromised WordPress sites, indicating a potential distribution point for malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.deep2001.com/images/library/File/68998132355.pdf In PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/43035940710.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135317b7ee3e---vexidomun.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/dokokasatapejadeveremesim.pdfIn PDF document text
    • http://ipublicity.cz/data/file/45055981171.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ed647d79---logeziwaxisejokufe.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/golaxe.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/kanuwibasebizizerigipas.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/60010361285.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/23142885482.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135708f78abd---53300485871.pdfIn PDF document text
    • http://kd-council.com/upfile/files/bonom.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/10523708435.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/31081148714.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/36497242389.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20210903143904.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/30497858078.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/borezakuse.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/34499625892.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210901192632.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/68394437389.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/dotoruwotate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=computer+hardware+engineering+pdf+downloadPDF link annotation
    • 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_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 17684 bytes
SHA-256: be2c97653ba79867cdffb6dd29c08dcdb328d81c168056687025d772c0659a55
font_01_sfnt_off00010bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 10992 bytes
SHA-256: bf49131cb38e465893da0a1f9eddf7f05abb44a6d02d2ef531c9f3cd04869962