Malicious PDF — malware analysis report

Static analysis result for SHA-256 8134ef946414713f…

MALICIOUS

PDF

93.0 KB Created: 2021-08-12 13:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 23b2495842eb30e5d2cc1714db7e810e SHA-1: 183ceb1a2a016ec884033b0f4a5d88aadeb79903 SHA-256: 8134ef946414713f80f86a5c4014253295b497188298f40f68fc0cba46e5f1ff
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/cb450f2a10b28bf5adf114b4d8a88396/xorugomekuv.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/s7lqoitn3ah2uraraf9njkdk50/43692907022.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/rekulasiwufe.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/110e344af3e5ff0087cf57aaf8e09d09/rojediwegijafudipox.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/34afbb942098e067d9b0eea1e503c8d5/70811563557.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/zowoxujabajij.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210726174458.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/sadabotoken.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef8908186---36865618036.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/kimejolanefokidapefag.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/30473407301.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/05878815b52240127822515e52cfb7f3/40765845884.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083fbed09de2---31925463414.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/3575636283.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105aff040776---50298149854.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/kibavitirigu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085da25d7890---selolur.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/veferirujamidineg.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/b668b2e4086e7e0c3db71abb2e2b7d98/96237284563.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f78e28e4335---japiva.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/lefezevedizefekuwamu.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/sobodaterogetobixukutedis.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f82c9d5f5028c0c650f713d7584bae34/tezubokofina.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f2e8d4654d269db8dd83278397d5f498/lamuxupusawuviduruxu.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/cb1a9465b6a5f2bfb487df2b92cd5cfd/82346966630.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ddeevk8q3pm55h1i8qqua539l9/tabiretoxipawufudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=watch+the+hunger+games+mockingjay+part+1+on+123moviesPDF 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_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 17576 bytes
SHA-256: 0ef871acf7691d0c37529562f3dc7e3305e2e3aa0d79363051651eade74edab6
font_01_sfnt_off00012f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001478d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478D 11616 bytes
SHA-256: 5555bd24e843cbd2771ed73e4988c7a3a412fdfc3b823447244c11ccca6782b5

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