Malicious PDF — malware analysis report

Static analysis result for SHA-256 20052d5ac24ebcc8…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 04:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77c781bd3f7ac1d401cf9a6cc93c28a3 SHA-1: 7c5a44ba4ee9ce69b09825a9c83c0e99880a6621 SHA-256: 20052d5ac24ebcc80b1d66a580b2a87b56b82852d6d4e78d570792f1b6f99fb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites, likely serving as a lure for users. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host malicious 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 http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/27436620445.pdf In PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/t7062tjjej3mlpneer9t9gmqn0/33276781582.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/99827731391.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/7liv5tjhjerovbstrp6e9h3spo/vifefetunekemozu.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/sf4ih0f7666gmeogpu15aj3d85/watobikodosa.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/69422798037.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccfd3c75a5---84408230064.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/xajonogakefeligamor.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161024700c13ed---2524252159.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/setozanu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/17c0718cd6ee7554cf82e900c3d52ee6/wazulexetomeninux.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/78392274456.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a104d1635f---95640088559.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/jofegajilonusufozizim.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe00974606---pobebewolokesesad.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/numaguzefazone.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/medotitiduxixe.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/newojafisu.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41dc10dde---wimibaxisuvejobefelun.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0588d7b531e127e373d79ba99fe32a89/340164242.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/fekonavoweku.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c496a541309---gelemilukewabukegupot.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b2338a232---dufodawakosafuku.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/70962817943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+strong+boxPDF 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_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 18000 bytes
SHA-256: d6dc5b82437d0dfc3eb7e683e4c7aaae96ed7f8ba383597e45d57150df5d56ff
font_01_sfnt_off0001125f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A76 10292 bytes
SHA-256: 2cba593b6dc45739011cbe5096f7714baf2c8b8f9a83cc333892b76fa1619435

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