Malicious PDF — malware analysis report

Static analysis result for SHA-256 664212ae895ecb1b…

MALICIOUS

PDF

86.1 KB Created: 2021-07-19 05:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7208d22e2c081896e58d770b4a348ed9 SHA-1: 4ff3214033fd5e332fceccc90b383a4948af69d6 SHA-256: 664212ae895ecb1b83b6099082858bafcb11c8ee46bfe6ee6f274d1777ebfa6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous links, including one pointing to a compromised WordPress upload, suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160867a18554e3---67972734903.pdf In PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6a6e7567bfc0f81e24dae9def130e264/gozowokugakatizinosebot.pdfIn PDF document text
    • https://noventa.cz/media/files/file/zunulel.pdfIn PDF document text
    • https://signika.pl/Upload/file/91737395412.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9d3e8685a---52485915485.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/bikogevipabo.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/8030564108.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc75a52544---76102854097.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/55050992868.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a70ef66d---13233203270.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/196e1f0d042633ad016341de1e69b42c/xozuvuweju.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/0cfe8e95c21dab9e6c55c30e96b3bde3/sanalafagasija.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/pifeg.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ufq2eib3qsdi7tf3e6am84ai6/65296245709.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/61233992568.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/m9310p3a342e2vk3jvva8cajb1/8050197088.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/dotilobadosamada.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ea2107c00---23274108118.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/vabowo.pdfIn PDF document text
    • http://princeverma.in/uploads/files/38044674979.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/67236937582.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/buxewifupati.pdfIn PDF document text
    • http://kbchina.de/upload/gepupejoxetatuberakemiri.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/99418687761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=yield+stock+meaningPDF 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_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 17624 bytes
SHA-256: 72e32b369ab124506fefbd9f2f91e27bbd4dc6bd6339beb475ea46f08d225003
font_01_sfnt_off00011b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13337 10688 bytes
SHA-256: 1907238da270b5b2ed7510082fd58ffe3167c8869a406666f213fa8fb6dc829a

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