Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0008214644bb37…

MALICIOUS

PDF

91.8 KB Created: 2021-08-05 08:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fe871d3c55744e96d465267249d20658 SHA-1: b7146dab0e7295bd0df8317f9f2afaa64194b5ae SHA-256: 7d0008214644bb37dfb1cb5ddf4868444dbdecb9b8cdd6659725c111a165fb03
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=short+vowel+and+long+vowel+symbols PDF link annotation
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f156a0b3b---27956914378.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096cc2b91bfd---3291990726.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210714_4DE15842E522DE6D.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-29/20210529113148221608.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4977d7512---75442841366.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/73571513538.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/kotikosewabipagabe.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/78448647147.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5002091217486f4011b7abfcb53b1ce1/46290910857.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e183f2c2c---rewuzunopomikisunu.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ba78f67e88d05129bfdee2d96eac6d48/nivugafuzirojura.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/72016331968.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abd79237d51---49200942246.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b0d5d415d---19369620596.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/3197tj9sqribk13btdscdoakp0/90731119441.pdfIn PDF document text
    • http://bjjiffy.com/upload/zepatuw.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/7deff02a3fd34947bd4e48227a1f1269/89002296195.pdfIn PDF document text
    • https://kristinanamaste.eu/files/vuxawitekekejeketatakoni.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/6e8dfb957af7701ace2d212987d979a2/nefobesofifigiwitomiwofa.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/wazonin.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/keximemu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c783929e6cc---puzatodumunobowebo.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2915b8196a715bb6ad47a0a4715eb49/21970974790.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/ziduzuzitanosubaluli.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_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 21324 bytes
SHA-256: e3e87d2a39463a9990cbb4d19bcba999a9520cd2f43125d17aa97c91c52cedaa
font_01_sfnt_off00013034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001484b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1484B 11084 bytes
SHA-256: 3f932e734d98acc0ed6fd5eea76725b1310538ab627aa07738191982702ae5d7

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