Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e11219291142f51…

MALICIOUS

PDF

97.5 KB Created: 2021-07-27 03:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87d9d7db2c4d0684f1972d45815e2e6a SHA-1: c23a5c8ab663ea7508fcc66707c0324ddc0bd04e SHA-256: 5e11219291142f51ad7913bb8708e546685ec87dced1cdc04ac4546814277aed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, characteristic of a link farm used to distribute malware or conduct phishing. The presence of these links suggests the document is designed to lure users into clicking them, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/45049b449ada24ccde7e9661368b5e0d/86280703336.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/jolejewuvelixusome.pdf
    • https://isosklo.cz./uploads/dixijosanitodoto.pdf
    • http://skogsformedling.se/bilder_umeny/File/78852074010.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8b5cd1459ef1fbd3731d7fa801dded8d/62327660346.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c166cfb20---23412889499.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4e1b929550154cd7ae3738ca36390658/bovitu.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/qj4aeumggrs2brp31jagiup1r3/70821267147.pdf
    • https://advantagelic.com/singhania/downloads/file/60400108333.pdf
    • http://tryinvest.eu/userfiles/files/47558089006.pdf
    • http://beulahcooleycollection.com/clients/870349/File/78910358943.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6730658b1---lopilimilolumotagedo.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/93564818740.pdf
    • http://maxidmum.com/images/upload/fck/file/finabuvaluxigatosum.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/p72bv732n26juehngerclg5d1k/tugakatogi.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3803831f6---jixurokizumasogozo.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609286e71a70a---22895544683.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac9735437---7706139509.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/88cb30fa8f75f76ca06a86219cf57f49/41778930279.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f14a15b801---julokunusibav.pdf
    • http://ersatzmonitor.de/userfiles/file/fetiwozonavisavinonu.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acc309627dd---74355803277.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/fc878fd185fbb1052b0311aa980287f9/22718720460.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=todos+los+numeros+egipcios+del+1+al+5000
    • 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_off00011506.bin
281c81be1bfa0b7a7d0f31578f2b17b0383eb81ba4e9ccfdf0556f17b0784bdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11506 18744 bytes
font_01_sfnt_off000144a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144A1 16792 bytes
font_02_sfnt_off00015cb8.bin
8e6d1ae993e07923ad97cbb6e6570e352f14f4a359f91697db46b1b1724ef7fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB8 11132 bytes