Malicious PDF — malware analysis report

Static analysis result for SHA-256 670263548bd1d4fc…

MALICIOUS

PDF

84.8 KB Created: 2021-07-05 15:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3136722c11026d08f64e20c22080e3fe SHA-1: c0392b97df9fac29de0458f62584a54614eba6d3 SHA-256: 670263548bd1d4fc10e1a7eda0933e9c729757d08acb14bf412bcf0c9e1f57f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://pistant.ru/uplcv?utm_term=past+tense+and+past+participle+of+wear
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/0gm0c50n3c4ov09j97vho7fcc5/jimewuba.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86cdcff61---duvogavejiwowikuv.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26558140577.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ef1daad29800717b8a6bad0c846575c/fowazedalatokubilata.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cb567d672---waxodaxu.pdf
    • http://chnli.tw/CKEdit/upload/files/12670065633.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dcb95fb78---36957427060.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/jdjr040rr1i1irigksk47v9bj6/1664914635.pdf
    • http://onmamtour.com/FileData/ckfinder/files/20210629_E1401D122C93B2F6.pdf
    • http://ngor2-3.com/file_media/file_image/file/93995318790.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a6bc16a63dd---suduj.pdf
    • http://maslag.eu/userfiles/file/10474514366.pdf
    • https://unosms.us/userfiles/file/19738179277.pdf
    • http://jplus-ag.com/upload/files/BodyFile__60C5B07BEBDF6.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4d377edc---41807663088.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c868d7d15fb---barerapal.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/11757a8d606a6c38e99f32bdfd7bcee3/62806284352.pdf
    • http://aranykoronakft.hu/userfiles/file/57690080693.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16077b1f16f12a---legorutulidavok.pdf
    • http://thankschicken.com/uploads/files/nonusom.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a4811ba20d63de19a6bf7a868b792d6f/56390838511.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16098322c3c5b9---gofiwifima.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_off0000e8fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 16792 bytes
font_01_sfnt_off00010111.bin
59d5fb8320fabfe130af2aec100ce82d7b3fcf70cdbfc54f4f2a66e0382b634f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10111 10700 bytes
font_02_sfnt_off000119cb.bin
98992824060c5bf8805ffea0643a46858e3df4babd7c2e9378f117f6472144d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 16992 bytes