Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a734e029aaf1b67…

MALICIOUS

PDF

83.4 KB Created: 2021-08-31 20:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b949f34e3ac58d1d0a8a71968fe864d5 SHA-1: 07a65b3abbbad4f55f3bdd218a87898a45369e36 SHA-256: 4a734e029aaf1b67158990fdb5707c9cedc7c7e661f0255fc57b4b2012120fe5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an intent to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://goteneplast.se/files/images/file/defim.pdf In PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f7ff6e046---24431868388.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf5a06d460---jozuxitafudofinepege.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b22ea6b08f7---24405180225.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/porolereteli.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bbdfaba25---51657951703.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/54218787850.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/raxewefurenazodebokukogi.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ddf6350899e7caa1bf5c10cf1416fd3c/69855332585.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/5119701328.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/gumisibimuzixaxixetutum.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092792452c75---1972537450.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/e7ae6a266451959ef188feba5f8818ec/92519664547.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/c8mr8e3qq52d4e0kcrc2pqm1g6/biraduzalukeb.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc90a5294e---58005049843.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a8080b3b7---divatujanijojo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd405ba5fc---loxofowibivax.pdfIn PDF document text
    • https://hoalavender.net/upload/files/37328203862.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707d07e73d6---jarizivoxinagitux.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb8e80f44---suzevajotevotusi.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/06/23/62964662102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=toy+poodle+free+to+good+homePDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/lekigozodetug.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_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 10496 bytes
SHA-256: 752e5dc3efc0e79c08088ad8757c2cf4b1e6f261d8a0f3d3cf4fb38d1723ed9a
font_01_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA0 18780 bytes
SHA-256: 659de08dba5d4238137f36e5c2be6fefa55d3a6602eb55f35c95d2eba394f118

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