Malicious PDF — malware analysis report

Static analysis result for SHA-256 e724d098a1a6175f…

MALICIOUS

PDF

92.3 KB Created: 2021-08-01 18:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 567f41fdbb6cfad91dc18952ef19432b SHA-1: 97c2a2566b2e57f8d60345834998d9c4d5c4e9af SHA-256: e724d098a1a6175f48351cdab7f149814f98a3b28b3aa5fbe10883a6499b043b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites, many of which are hosted on compromised WordPress installations. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious payloads. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/34c2b3733e4231b3e6a0fc43058e258b/32000336865.pdf In PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/6tpmblf2p68hl1e7aknv5nsiul/95815859634.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/wagidu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a9373933d36---bogomiwuset.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093e74683f0b---mogawezujefujasopuwal.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/c7elbdjklc4cg5m00e5a0hk9mi/89067015420.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/newameforefidetuwurebiz.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/6703577d0ef564990c47dd1b142f5f5a/80906109370.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/99237329557.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3ce6017f218e52edc30c7d982234bdd5/98434407182.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/birugineta.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/tazirakujejunalimaza.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/wuxodoxuvafefabavirota.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/21341633479.pdfIn PDF document text
    • http://lossfundraisingevent.com/clients/f/f5/f5ed5e364f2f51aa46a4c5982fab9a07/File/87405637467.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f617bed28---vidobilitiwa.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721026da48e---zawolasolilasunod.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160840fe12184d---numuga.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/628233c9f8dd698ce6ee1698f498827e/bajamoxujofovozadizexe.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098317b81091---xakutefizevoz.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/xagurapiwaruwososibivub.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/mapika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=angle+of+elevation+and+depression+word+problems+with+solutionsPDF 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
stream_007_off00011106.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11106 19788 bytes
SHA-256: 58c4f192e6055ddbe6f37d9488fe0f495d7cc5deb5844ef6b716da49039c19dd
font_00_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BD 11320 bytes
SHA-256: 951e596044b43b02a438d9a041fd6d227db340349f3cabb74d623e051d6b19a3