Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df4170efc2e0eb8…

MALICIOUS

PDF

79.4 KB Created: 2021-07-01 00:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab24937e2b23871e0f56e0c24120bfc5 SHA-1: c7d6b11b6102fe544e0aa29f1392fce652a70ddf SHA-256: 9df4170efc2e0eb8f899e2c5753a4c234a047a32cd1e1e1de7890d58a38eecf8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic firings indicate it functions as a link farm, with many distinct hosts, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://schokoladenfontaene.de/idata/lasokubazelakup.pdf
    • https://champion-osk.pl/userfiles/file/bisifonasotokek.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b16109d77f3---fimabimijapavawavozat.pdf
    • http://mobiliteit.nu/files/wikufopixalasap.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/2oug402s1d7darc2rj59eju92h/95064484669.pdf
    • http://grandrosso.com/js/upload/files/fimenumuwimeligizikur.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/4359909278.pdf
    • https://maxflowfans.com/userfiles/file/dorunotekafifoputexel.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/2ac2508e33cf12ee8e215637907f102c/borilibave.pdf
    • http://itkaufmann.com/images/fckimages/file/zedefemowojumuk.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/hjj5ls4q3iplq07dbi2ngoosn7/bajopataroluridapona.pdf
    • http://curry-box-deluxe.de/userfiles/file/vuxifesexofif.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/007d38fba603e61964d29349b7af3fb2/86132048593.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/1990f349f318fed5b024f48ec9c08ac7/54411449447.pdf
    • http://absolutelyneon.com/userfiles/file/tebafuneluvaribefepud.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/01776e79b230aacdd1c92b10b62c66af/gipivavefimepob.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/be4caf3134a1b346fb81d07d2710d56a/54563849058.pdf
    • http://muzeumostrowiec.pl/obrazy/file/jeroneserorazikoke.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/khr3cg0iduu1i342ph4p9ofji1/zowipomukuvukazuba.pdf
    • https://apskarota.org/userfiles/file/47722507851.pdf
    • http://mim2010.ru/userfiles/file/61953508594.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d37a6c7a0d77017b8d0adf87d485a222/93522778111.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+find+end+behavior+of+a+polynomial+function
    • 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_off0000d0c2.bin
50057a369db395c91fa5930b6932fa008fd0e596e5223e4f95a746e86cf545b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C2 17284 bytes
font_01_sfnt_off0000fe35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE35 16792 bytes
font_02_sfnt_off0001164c.bin
f8339ecda352a95ab7a78d425d1b1737fea90ec1e21a22cef93c90e3c23a60e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 11216 bytes