Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57e49abe2e91b14…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 15:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c9667b6b13c27721d870480a6367d49 SHA-1: 5023115095ca35b5365d44d2dbb861d10d8fdd68 SHA-256: a57e49abe2e91b1404d1be5b74fa0efb40af0c58f334b43d5802168a073beb2d
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites. The primary attack pattern involves luring users to these external sites, which are likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613187b4237e0---fimojafaxazosuteno.pdf In PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/vamufotimi.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/wedige.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c02f0d193e866df6e357f5b42aa9ca59/nebanaveke.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/95076658917.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/bidoxuzuxevunuzib.pdfIn PDF document text
    • http://pneusmarene.it/images/file/10821864247.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b320bf09ae0f4ade78bfe53d67d9f13/70070848685.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/77681109238.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/nisaren.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/36636998776.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210905175117.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/88464021087.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/lezefixosado.pdfIn PDF document text
    • https://grouptm2.com/contents/files/dolada.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/13469403611.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/vulubetuwikitaseforuralu.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/14318813964.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/xugedofovifiliteg.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/3a50eb3ba7716bcd3b7256d710d26cd0/10228127409.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/76591232205.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/mexikinewefiri.pdfIn PDF document text
    • http://usateatop.com/_upload/files/36223938170.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/difesujolegovexopafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+pin+telegram+groupPDF 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_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 10604 bytes
SHA-256: 1d59c73e2e893cb50a680c9a22b0bd1f52ee73bda938f9b6c9f9dc6f7342e043
font_01_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C4 16740 bytes
SHA-256: b16696824a9bcabc8e830a5551747c9482b43b31cfe6f2ad30dba8f3e52ad53b

Open this report in the interactive analyzer, or submit your own file for analysis.