Malicious PDF — malware analysis report

Static analysis result for SHA-256 031a7997b57f8841…

MALICIOUS

PDF

71.6 KB Created: 2021-09-06 04:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6ae383665e234fd59b1b75dec18209b SHA-1: 1acc24e2a80f3225b2770de39a8492597411c741 SHA-256: 031a7997b57f884122890f1221ffe010898912b754edeed1a6786b2ba38da86f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. This suggests the document is designed as a lure, likely for phishing or to distribute further malware, by directing users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=agency+cost+in+financial+management+pdf PDF link annotation
    • http://studiobonvino.com/userfiles/files/sumekevipad.pdfIn PDF document text
    • https://kawanmto.net/contents/files/sibobisibudapujiti.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/12029904531.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/timubixovasuzelujinudodu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ac2a271dc---62697741801.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0ff2df3685ab80eb17f203e3d6310754/ludifefikupinibusugotudez.pdfIn PDF document text
    • http://imaginove.eu/data/Files/29672869951.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/repomower.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/64859023640.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c12c5be3982---21063885097.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/7c92f346336601c9e784bbb4d5e0de66/77422984185.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/63997053672.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/94176159537.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/fikojol.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b219b2331---jonevajazun.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0ac077d53c45666be26a1b64136267da/vewaneb.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160970cbe6e372---94598409492.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d399a0c9e---votudaxisiwelovevita.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/venapitelufuvitifugab.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/pevozojivijo.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/satanutulavamasajalodafe.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/zatajodaxavezebaba.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736a6dcdc06---17114793753.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f24f391751a---93022272957.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b618c0e58b6---mabik.pdfIn PDF document text
    • 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_off0000b76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7F 15716 bytes
SHA-256: fb5b1958de6a52682e1ac7ccf46073397ed894ec65e497260b47a7c4e7554caa
font_02_sfnt_off0000f76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76C 10960 bytes
SHA-256: 2146f4d4b2f0f432e58b597bf5cbc2ccb0eb22891735dd82c4aa7cee0e276ec3