Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb1669f4d82cd1e…

MALICIOUS

PDF

95.3 KB Created: 2021-09-05 04:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c905f3dd7508546b24c633c3a0b5046b SHA-1: 3170548b8df395f4cc0411a488560cc7fdde7c39 SHA-256: 5bb1669f4d82cd1ef40ff67b618140a67ab62021fdb2a65b12f8878f0065c80d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms strongly supports the classification as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=n+acetilcisteina+mecanismo+de+accion+pdf PDF link annotation
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cf34fb701a---fasoluzapinololapogola.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/7296343516.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/847a3e655f39de6c009dfe873dfe5720/xofagovaluja.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/tikikuwewiwixezi.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/bawimavum.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaa9422074---8522213351.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/41530681313.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/f50eea0627d1675e6ccd81102321712d/loseramafedenakinowukuf.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076aa1d95464---4891190131.pdfIn PDF document text
    • http://gerocuki.hu/user/file/texivabonivikugato.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4248ac384375c1a9cf3e5a1bc7b63b4d/90480451699.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc43de8bd8---zifugakopikox.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/zeferudoloku.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/3814248c579993eb48708c58f76c8397/delimeli.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861f11e261a---54294329375.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9d0929fcefa19ca87ba7b42fe2a69ae5/94736087489.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/maguzovewajeb.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/0ii2mgbhdl651pqdkinjnu4chq/pijigoguno.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/9631873397.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/9ca16351015dcf57654283f8299d9aaf/65941499634.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/fudewa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 10660 bytes
SHA-256: a60bc6af3467e8b24206103710d61f12e6920b10d478311eb80da4100ecbd34f
font_02_sfnt_off00013dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEE 19472 bytes
SHA-256: f4ab9bbe63fb09e3c2b5e5a376700c6c744fd384b0c6f5ee02572c7b758aca1c

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