Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a146190831a5bc…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 08:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a8f572d3065b7515c11e40e2e962184 SHA-1: 415cbd7b05c94745143d84e0bc5485becf537730 SHA-256: 12a146190831a5bc1e46cdb655448f50f16104c8716e26ee6928b62ca3fbfbdd
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URIs, many of which point to potentially compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI heuristics and the ML detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.heksan.com.pl/file/povirowuxomufup.pdf In PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/99266730889.pdfIn PDF document text
    • https://kildevangen.dk/files/11025076722.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130a24685ae9---64738811572.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/nekudizab.pdfPDF link annotation
    • http://logopeda-empatia.pl/content/file/37853879318.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210920/file/16320990801992.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/zumuruzezabalo.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/61140265940.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/3649228935.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/88205373822.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/dakubifimezudedizabe.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fb98ad52ec9eaacc52ad7994c74a39c1/18783188642.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/ririr.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/78402508687.pdfIn PDF document text
    • https://12shio4.com/contents/files/kolosanixowi.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/40247704789.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425d1f1a9ee---mofaz.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135795a974ec---53491467911.pdfIn PDF document text
    • http://tavio.su/files/file/jajobijawolapumemi.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/xujovovabifokovalopam.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/vixifomejasonixunuluzum.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/vovexolesidez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+ide+ubuntuPDF 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_off0000e2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B3 10088 bytes
SHA-256: 2f200e3c0dab954f310a3340baac829162b88580a66608474e17f376eae2c310
font_01_sfnt_off0000f942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF942 20576 bytes
SHA-256: ab9a454dae6b8db344c984f133c68fefea4646bb096596dc1ca30ec2d41cccee
font_02_sfnt_off00012f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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