Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea68e4167652ce89…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 19:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c870412530347d65e48532b9de28c81e SHA-1: 69ea7c3cfe542744ef68046ae91c9807bd037616 SHA-256: ea68e4167652ce8962d7f01beb8f4d57bf479d6f42400bae8b1376c4b9ac8b72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using such sites for distribution. The primary attack pattern is likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1d8e518a2dc18e2b8af95648f6941149/98317013270.pdf In PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/2b3ffcc3472d75dc2ba821b426d4e968/19700678012.pdfIn PDF document text
    • http://ezibra.pl/upload//file/37575920580.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/33615640770.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/29403243674.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c872d48512a---fenedametabefifamotinizi.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/zuxurani.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/faxizezalakuxipadadugab.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160875a1f97303---buzodikazamib.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/kunazepakexuni.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/14243252193.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/89396636235.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/sorodivovi.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72004142035.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c01d852b480---dekodilusukafozanelisazu.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/19248297410.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/wivovunotilega.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/gibosilolavizudaj.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/salutaruj.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/96023651366.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d7ae3293---zejawanisiwakox.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/39033468324.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c80412ae2---33293836619.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d468edebd02---5828285123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fields+of+athenry+lyrics+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_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 10808 bytes
SHA-256: 06b597805867473aa599e054af7242a1c0e0a483549641aae79a1a7199933935
font_01_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 18716 bytes
SHA-256: dd0418f2fa55a20f0c8da98de3f42f570db4d631c97fd8db3a15394300e9fbfe
font_02_sfnt_off00013327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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