Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc631d03cea1025…

MALICIOUS

PDF

78.6 KB Created: 2021-08-06 23:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf00c7253e20562e931ef905c29bad9f SHA-1: 9b4dd53ffe36e2c3a1eb9702ef776dc532223dc7 SHA-256: adc631d03cea10257e4e9537374ecaa047816d0ccfae1828ca582f6c0e663832
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as Pdf.Phishing.Trojan. Heuristic analysis indicates the document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to manipulate search engine rankings or direct users to malicious content.

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 http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4809f55041---juxabazeso.pdf In PDF document text
    • https://novahealthclinic.ca/userfiles/file/tariler.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c71ce70396---96451474156.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/93fb10bde185ca479330a1bef688c8ff/52347009213.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/66889668041.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e549ea14db7---jarosobepepavafu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/b8dcb71fe9bcae4012eb496a9e52fff3/15848487486.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/pekawepegopopokir.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6a7a7944ef0341b85aed47dc0f83c0c7/47727546219.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/58a5b10915ac030a88ac95f2450aeb7d/zelokofatagu.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/69dc078dc7c19a004ae3a6ffba0d5b98/pegig.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc4d8ff67---12766703982.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/59076344808.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/16508184357.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/51514522821.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/13368572610.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc9062fb40---15973599996.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/dajubisamopewawonasef.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6a0e0fe7---fosimazekimixalogaregos.pdfIn PDF document text
    • https://bem-sa.com/img/file/75557903558.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/guziturakedem.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/sowubadegorigakeluxar.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/43609300835.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9c82409f6d1bde7f4e938df30e9f486a/78759174943.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/103748280860a61e596660c.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=independent+vs+dependent+clause+worksheet+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_off0000cc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9E 16348 bytes
SHA-256: 76dea080e84909723d393cd7c9b37c983c163402f166309d0602456121287f7d
font_01_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFB 10920 bytes
SHA-256: 1a7b213bfb21e823ac1a217ed7d0f38a1a053864cdf8bd8a030b3c3f96561d7f