Malicious PDF — malware analysis report

Static analysis result for SHA-256 963cf012502a00a0…

MALICIOUS

PDF

84.1 KB Created: 2021-06-28 21:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 799d43b2eb0677613b02445c45c170ba SHA-1: 19280a94c1f9bfafb26042a1e2b9b4376317d2b7 SHA-256: 963cf012502a00a02b532fe804730186556cb47a3869c2f4f869fb5ca03b508a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://proxima-design.cz/files/file/jajawu.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072817de4fcc---2105990520.pdf
    • https://kp-bs.ru/upload/files/wivelo.pdf
    • http://carzip.biz/files/uploads/files/mujoxajosolijemapifotad.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/34229942470.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/082n0skclgiqomovatslt1itnd/zagowetonija.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a85b1f6c0---45723479021.pdf
    • https://rainbowfurnitures.com/files/files/96267433855.pdf
    • http://arcomproltd.com/userfiles/file/55310565926.pdf
    • http://curry-box-deluxe.de/userfiles/file/40019365945.pdf
    • http://aardbeienfeesten.nl/uploadimages/files/woxurim.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6cea9d0c70d4ca0238c6e16c5d1925b1/26357175408.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b1g7f6v8v5ei50cbvmspq1muk0/34843329179.pdf
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/fudegutijamaledoj.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeb8e9cff3---2865955110.pdf
    • https://parklanehotel.asia/userfiles/file/sadujavas.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7a9ed775---73628038702.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/6e01c0eab1281668d78efa1428d4f97b/botogegifokavuwamupijedom.pdf
    • https://unosms.us/userfiles/file/josavixubak.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d690f0532---1584522404.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c924b3c5581---31781516774.pdf
    • http://www.abcklima.hu//data/editorfile/sodixafit.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b8b0c836c---xitogog.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160998421143aa---22623377459.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=13.2+oz+to+kg
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e743.bin
2d911d6e7e225a1f56091a1418da078f94c74455f180fc758d5a087af68ab4e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 9944 bytes
font_01_sfnt_off0000fd81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 16792 bytes
font_02_sfnt_off00011593.bin
5727a86084c202fdc0d363fd54b977ca9b445dac652fbae93d8820f93c9781b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 17244 bytes