Malicious PDF — malware analysis report

Static analysis result for SHA-256 df51d798cc80b0f6…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 12:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02a10dfc3d03da30daa2ae008772b9b4 SHA-1: e890b4ca34cd7822b6d9da63e73bda0167d87ff6 SHA-256: df51d798cc80b0f6a7ef2c65dc0348d2ecd858703a9dc2cfecce3cff446e068a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, indicated by the presence of numerous external URIs and a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript stream, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality by initiating redirects or further payload delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=distillation+of+petroleum+products+pdf PDF link annotation
    • http://cokhitienvuong.com/uploads/files/maditegidanu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab143c208c1---29155284451.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/83431670355.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/nipezuxofiguziwekizepaji.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c4417197b03---29005844100.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9a7d059f46150de1bec7174a4aaf0b45/sarumude.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/63553260240.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2ik33t3gnpmghe6fg1jlkp04jj/jedagoladibiko.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/127240876.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/77675226293.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1289544325---31743851030.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/lezimusolixavigojefuxa.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/tisemobatulumosuv.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/96549606264.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/74342900971.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/gafexipukatuw.pdfIn PDF document text
    • http://edgecs.net/documents/6735281442.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/47591456344.pdfIn PDF document text
    • http://halmar.info/userfiles/file/49187007866.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160824a23c4b47---58552630220.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/jumonokuf.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/11319036949.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/5273291925.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/pudepeto.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/90887760518.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/14438075788.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_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 10884 bytes
SHA-256: ea44274f0fedd7e7956c0bc6b7a6c607ea1b97f9b9b6f2932fa0d615b7118960
font_01_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 17828 bytes
SHA-256: f0d53e96d5eeb2f4f962fcb7b478eb870bc269d79f0bf6d98404b33ef924a6fc

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