Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d08861ed1183fb…

MALICIOUS

PDF

109.7 KB Created: 2021-07-04 02:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3911363c0b7eb8c3869a633c2e6874f7 SHA-1: e732d183ab088b774c3d8c23adb9106aa04972fa SHA-256: b4d08861ed1183fbbba31d5e6ee68f52808bea0f319f2a3771a8145a459ecd1f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it is a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The 'SE_INVOICE_LURE' heuristic suggests a phishing pretext. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing campaign designed to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cnc-soustruzeni.cz/files/file/86724970358.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160764de956302---29828334062.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f93426ba418d92e37f52be29d1f0071b/jesanifoxitirawu.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/463a1e009cae1524e897b37accef4923/jinerexi.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45ae7152be---94980740254.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9834b391cc---bazolo.pdf
    • http://colantuono.it/userfiles/files/betumobufokamelirigorimuv.pdf
    • https://keongracun.org/contents//files/82844452898.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8970ad332c10374914cc1bf19e0732ef/68745939075.pdf
    • http://dralituncer.net/userfiles/file/5207444123.pdf
    • http://instant-image.net/UserFiles/Site/File/retalisodixowen.pdf
    • http://hayatteknoloji.com/webimage/file/mujawetalalirerix.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/l2e5lk46pvi6albhjc1it7c52b/48355315070.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa81a0425---dujot.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee14756ead---xanebabuwevoxuzumefasob.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bogigifaju.pdf
    • http://bakoca.hu/files/file/dudewudujusutokofusoxova.pdf
    • https://ludifrance.fr/userfiles/file/65953650187.pdf
    • http://eprdel.cz/userfiles/file/42181227475.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948299adef0---folemimed.pdf
    • http://veterinariogiardinelli.it/userfiles/files/wakanudunekeluxobafipol.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc9c4ede2e---delubeferudisidirase.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5c204a0fb---jadureteno.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeecb57ace---gufemasivosigigejov.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/865e6c04cb2ab1763bf2da7bcd0698f8/xuxikegoxosifogusor.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=international+trade+theory+exam+questions+and+answers
    • 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_off00014a08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A08 16792 bytes
font_01_sfnt_off0001621a.bin
e75cd9f67b3adb1a7c1fe37911d716023c9a9d5c0366e43106dbd3f741520e04
pdf-font-stream PDF embedded font (sfnt) at offset 0x1621A 16828 bytes
font_02_sfnt_off00018deb.bin
ce50a5548faea8eda559f356aa0920726d37e7d87f0e67307d2fd5625c2ccb78
pdf-font-stream PDF embedded font (sfnt) at offset 0x18DEB 11012 bytes