Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfaab88d3de2783b…

MALICIOUS

PDF

87.2 KB Created: 2021-07-02 13:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1fd1d8da481b85ba75779539fb9a3096 SHA-1: d4382afe8060a039dec7945b9e161f9c7ed1d7c9 SHA-256: dfaab88d3de2783b37670d0703806e2f025aaf6325112e3f117c73eb5c1eb271
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be directing users to potentially harmful external sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=how+to+answer+the+question+what+are+your+career+goals PDF link annotation
    • http://suapaiatuipelehakefamily.com/clients/80707/File/vewugojo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/4318e1bbf0cfd75810cc5de11d2442e4/3649529413.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/12377706744.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a06e46aa4---11142984690.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rojulixidenagomuxepefazof.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/wirubafonuwugitodun.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/nemapoxagogusewokodel.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/jamaromosoko.pdfIn PDF document text
    • http://planetamama.ru/files/file/nazebasis.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/72707608509.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc69bfd45---tegadexujazi.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075658e45058---xotijasixilereka.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/85361082590.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/17421907533.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/15206663564.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/a811d1ad2f5261a2f48341a881d24608/dusebevo.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/wonaxumusofebivamorakela.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/55592617521.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160871e66e0cde---61034726181.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf9825d15---pasiza.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3edb04464c---jamisowomizifelodikot.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/kipakutukuvade.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/nazow.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774d155fe18---13508160391.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_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 17284 bytes
SHA-256: cbb754d6944d1110463615c76d75262f620067f4effe6d5d2bb75a1199ff7941
font_01_sfnt_off00011c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C54 10944 bytes
SHA-256: f91268d7b7955212be920658b87883ec1d3c2dc0606f43ae2e4fc24dcabfb57c
font_02_sfnt_off00013562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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