Malicious PDF — malware analysis report

Static analysis result for SHA-256 af592d35ae62b376…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 20:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6b5ac53baec6394f3d0c35934e330187 SHA-1: 3c2f7a54844c6cb2b1d115ac466baaf5dd4f0f44 SHA-256: af592d35ae62b37636c8c3c576cdaf3456616f12f87b0b0fd7d5d1e8801e1851
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a malicious intent, likely phishing or malware distribution, aligning with the 'Pdf.Phishing.Trojan' signature. No scripts were extracted, but the structure and heuristics point to a malicious document.

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://studiogalata.it/userfiles/files/70431466091.pdf In PDF document text
    • http://stavo-bazar.cz/userfiles/file/17669358171.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a353b7a00---pafobowoluvekakebe.pdfIn PDF document text
    • https://visualarchive.bg/files/xonak.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/furolisavow.pdfIn PDF document text
    • http://trivio.it/userfiles/files/95773095609.pdfIn PDF document text
    • https://unitjaya.com/contents/files/68303914225.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/foxewijijemiket.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/19280614213.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/74624362097.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/5099357698.pdfIn PDF document text
    • http://pb-book.com/user_file/file/62919418862.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/pugivajilewunaso.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/38c0f272216ddd2c4b6c6f8f0b868e8f/56075392861.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/48454789928.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/mjr0t387vb312k1fpf5n1prt4t/86783749506.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/28144829233.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a1cbb7901---pabeniroxe.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/49247772883.pdfIn PDF document text
    • http://teresachild.com/upload/files/51961883292.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/paris.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18900b348---fagalibilit.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///bikokuneduxi.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/vozis.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/80872515782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=emulateur+android+pc+windowsPDF 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_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 10844 bytes
SHA-256: 99fb3f92983a6a296c5a7a1fd5fbb2991fe20a2310d55a77aa3020bca9192c50
font_01_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11392 18064 bytes
SHA-256: cafceadb92def66a6a4c9f8d44e3c0cb809c2a935cf4f2e760876826c98afa1c