Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6824e24876a1835…

MALICIOUS

PDF

93.8 KB Created: 2021-09-03 03:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef16a17fe379c697a3ac73599137500d SHA-1: 65e62fefcaf229710a106d08689b8cfcb56f50a8 SHA-256: d6824e24876a183592b37bc0b37af6445a44a90ecba3d4a8741b767b8cbe9aec
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://solamsys.com/userData/board/file/netasa.pdf In PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/43699c285b77224b1659fa987ccd9897/bizomi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16121865a31ffe---99017200156.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/wewabimodaxuvibisewu.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/48598876085.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fb72e8236---65043618285.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8ac60199---gazenosaziguvidefe.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3648391ada---7365140753.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160803c3f3cca5---tujizorupebisuzemipor.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/nibifizisote.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/55491274773.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/77e0b5ca407a2dd811e071e97829ad7f/wadoxuwimi.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/78505742312.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/zerob.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160805b3e4362e---watoletodirivipo.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/vitakileziwusoxan.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/povamagupajunejugejilab.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/91346011030.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/80479718198.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/kamufajezijilunewas.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/gasapedimogup.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/31790253441.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/hi351frtkt8j50h2adhgptr3j7/dudefukegezoxer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=vocabulary+in+english+with+meaning+pdfPDF 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_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 11476 bytes
SHA-256: 4e2da0bbcde75b63737cbd865f643bcae60dc618c0780ff1d629dbf54148fa91
font_01_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F5 18220 bytes
SHA-256: 8730188c2eb4c953338605bad0c8824547f1bd7acd79fab1f8a3b49078c62b11

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