Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7699a7e42d6a31…

MALICIOUS

PDF

78.1 KB Created: 2021-06-10 16:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 87589d02cd06518c493da9fd12a5e96c SHA-1: cae8cdbaf7dea900d82bcdfc7d263f699173ace2 SHA-256: cb7699a7e42d6a31dd9e2930849c9a24cf57b98b51c28799806c355d5c859ed9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8668

Heuristics 5

  • 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
  • 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://nomylo.ru/uplcv?utm_term=apk+nimo+tv PDF link annotation
    • http://ciskmv.com/css/file/67014778112.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/82600669525.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/npgr1rbqutgjesp8lan2unih92/81322256261.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a997bd3c1---kujirinunenasojijavore.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/rozexoxovo.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607883e6e818b---43432056942.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ncg3maitn36k272d2vt0krsgt8/98780692997.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/38467745228.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/majexasubom.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/103c3620cb4689345508992a58719dfb/44590438711.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609875cdbcc20---44634073007.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/52978ddaccc38aeac2482fff850bb6f0/94865588755.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093c480dc185---mokimenolarojazaj.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/k68q53jr2tp2pqe1030780m0ea/patasaperoponisuxum.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/84552883144.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/rubozuzi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 2952 bytes
SHA-256: cb9072f881c1fe0ad8900bbcc5a20a23fabb306412f64e001cac76c2a9509f2c
font_01_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 4564 bytes
SHA-256: c794482934bd6c1424c01b7f5ba955be40a7fd0a4d2a4bb62fc9e440a74d556d
font_02_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 11320 bytes
SHA-256: 92340ecad4dfbab7f053ad0f7bb8ecbcdfd5a64a0445ae7b7f94986543b3c7bd

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