Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b33b1d15d3fca1…

MALICIOUS

PDF

162.0 KB Created: 2021-08-03 04:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7488150f81bd4df892fa04c878d109fc SHA-1: 06c37b508dab0e8549b102042dd8ae3e8379708c SHA-256: 11b33b1d15d3fca12904422f4b3101dbfb0d3d777c9f72f28a59ff7c8349fc3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9586

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://paroles-vives.com/ckfinder/userfiles/files/60340344963.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1a8b8183c74db48ff3bcbfe5784d8ede/pubosadu.pdf
    • https://observatoire-omic.org/documents/file/4302301583.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9d8a2a6461e5431f5a116c659601f079/xegaregeluvezimimifibanol.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c639c2772f---33087443095.pdf
    • http://newmanclassof1965.com/clients/4/4a/4a7b3a1a0fb21659e68ac19badabb541/File/8556474549.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160872e3436150---refilapajakadipitugupawor.pdf
    • http://jubileejec.com/userfiles/files/vojipizokegigebuki.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abab10289e9---78856847675.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/6522bf042adf1ea8111bae09c65a233e/3470057988.pdf
    • http://wolfroccatiassociati.it/userfiles/files/77713686625.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a109bd77ec3---fijemenapote.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/56f2d4d3b0dbebdbffbcdaaa5330ba31/lavigexiputegilejefuva.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0996419531---xinukopipituma.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/l7vvvdpnk0seevv68tp2og4nmd/86640986518.pdf
    • http://assushop.com/userfiles/assushop.com/file/80500138273.pdf
    • http://zit-tech.com/userfiles/files/8549133407.pdf
    • http://nail-free.com/ckfinder/userfiles/files/46029480957.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/9d4v0vbl2v6vbokotr9795dtjb/74511343863.pdf
    • https://karinbentum.nl/uploads/file/mazerobikogiwodafome.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d45c3391d---babosuj.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0b6e6e3d48f4563d907368d46dc45b53/jimetekudu.pdf
    • https://tanasiri.com/piceditor/file/futireputikoxutewubuni.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+render+scott+robertson+pdf+vk
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000209d1.bin
be3e79cd64b63e8575d6dc07f5498a3ca253d53ad9831b1e80b212fc90abc73a
pdf-font-stream PDF embedded font (sfnt) at offset 0x209D1 18120 bytes
font_01_sfnt_off00023996.bin
61685dd732a551f1aa14bba6f48453f78a7f154f5f893f923e854519a44a0cd5
pdf-font-stream PDF embedded font (sfnt) at offset 0x23996 10688 bytes
font_02_sfnt_off00025205.bin
09ab3a595b27ec61cd93fd4cdb60a60755e3fd0dd2eaf64af19d9265871a6a9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x25205 3576 bytes
font_03_sfnt_off0002600a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2600A 16792 bytes