Malicious PDF — malware analysis report

Static analysis result for SHA-256 98de8a6be1dd99f5…

MALICIOUS

PDF

76.0 KB Created: 2021-06-28 22:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87a9b7c2ba293a78d40fb123267ad92f SHA-1: d9a018c997d10ba739602d617939d69674769a35 SHA-256: 98de8a6be1dd99f53cb79d67df33930dfc91b81073971b800cc4a0db8f00a5b3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, with many URLs hosted on compromised WordPress sites. These links likely serve as a lure to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1vjr5bdkorof050mjvqdoqlcve/tedojefelanelivajazelati.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/le4lbenaoi54rebdqarcn1u0fv/zajib.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/2eca3677bbf7756e2d535eb844ec4d0b/bazotubezepapujatoke.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f474heku1vdltksoi6uanq8bd6/wadagebatezeza.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160873752a3f72---pokekiwukaxasadin.pdf
    • http://cambridgekapurthala.com/damana/userfiles/file/98121093224.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3e8c9e1cbe163c30f678aafb837c588a/gerozojuxu.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b24cef799ba8b5b5e82b8809d5aecb63/84781156456.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25d0419bf7---kunitalun.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bed23097ac4---75759053230.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f04a82084c---nirekifu.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b121f0559d---19257900293.pdf
    • https://getadoc.in/ckfinder/userfiles/files/88487651633.pdf
    • https://badoza.net/userfiles/file/72491766818.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/0v4gkas8ce6mh6ert9k51427pk/20145983652.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086c0be8a409---88750330864.pdf
    • http://nappsa.org/userfiles/file/netebum.pdf
    • http://urgentcarepb.net/userfiles/file/jidigolirinefijetugo.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/89668005924.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e40156fd6---90023289580.pdf
    • http://ateliergermain.net/sites/default/files/file/dodonorefixanigowuwu.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907c4195ddc---80989804698.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/9efe5f261870b8a5cdb767d3e5dbb02a/42215983245.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d53b7bf9f---78055878011.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=why+choose+a+saint+for+confirmation
    • 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_off0000c71f.bin
f21847918f4e67d2327f181c2bf4d5104b28a8a7dad727d87e616d4788b3e7d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC71F 10664 bytes
font_01_sfnt_off0000df70.bin
10f776ae3d3c7edf19a3ee2d6d3951b3dab9a747feb9a87e3c864f0429ee011d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 16120 bytes
font_02_sfnt_off0001090a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 16792 bytes