Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee3932e0a8e395f…

MALICIOUS

PDF

97.7 KB Created: 2021-09-07 01:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c82654ae1e11035e22ee5a167def6323 SHA-1: ca61918caae47d34892ba0b4ab9b564fea11ff38 SHA-256: fee3932e0a8e395f72f8eaab5946580b6038060970d75d110ddb21c6208c1576
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document's structure and embedded links suggest it is designed to lure users to malicious content or facilitate SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e60fb625cd0---61824249886.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf54umi1jk6srherutiq0b7qnj/tinurukiwiluvofe.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/48085782592.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont//file/3325776571.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/bcb7bfd564d3ea57f8f0ae1509dfe17f/bamurezuserijilozeseli.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791c89d919e---5226148510.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ceaebc5fdfe32fa2328e7650b9b0f6b6/dixenuxabegir.pdfIn PDF document text
    • http://www.bandungmesin.com/file/velonujelinano.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/felut.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/42011849583.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/xasowulawisomojilumulir.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af627445ed1---wewusomelojapumexeka.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/lasapevupadamem.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/16426243563.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acc1a2bf62b---jarowufewikitowazi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/940b6fd6472bae327cc57d45c83f0d9a/nizejenulusobomufuzu.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/lojefefelosuzopodavu.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/donedukaduxikojuxil.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/54bf899323653b1517ebd74533034daa/xiremu.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/kabom.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/bosajaxotujikaloguza.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/rimexilo.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/10007868590.pdfIn PDF document text
    • https://rajaunited.com/contents/files/68931401606.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5q243lnkkbe2mcg1g9a1fev71h/fobelomefovozile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=como+interpretar+la+biometria+hematica+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_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAF 10888 bytes
SHA-256: 5de5371293d5e3b4ede05498c6762df0f24589aa2bc697d9670b5d7e7a5a4f21
font_02_sfnt_off00014363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14363 20040 bytes
SHA-256: d396a3cbedd774f70153d524c41c784eb1135e725e059c4f1376648ed8899828

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