Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef1764ce68250cc…

MALICIOUS

PDF

117.1 KB Created: 2021-09-03 16:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c162a186e22436e24c44355b260f3644 SHA-1: 6c96a949ece50781b1fa32f256347a9942235d72 SHA-256: eef1764ce68250ccd5211701e5531457970b085c3488edc86974bb8c12429584
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically indicating phishing and trojan activity. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external links strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=binson+echorec+manual PDF link annotation
    • http://rajskiewakacje.pl/userfiles/file/91225936683.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c658710f4c---jemabenuxexoka.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/ninajizuluzo.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/zogewaluxomenexujuni.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/kelawup.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/baworejogiluga.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/talojirituwugunawozaxi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ba629b8e3---fetasipob.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/juretodivaduxa.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f38d44b83---33646880508.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/39290702916.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/443bbefbd8b0f9cffd1e38af6b0f9d5b/74313115536.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/94701821462.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/mixerovabiluwoxusevezi.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/40468207025.pdfIn PDF document text
    • http://carszana.com/image/upload/File/liruxisebiv.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/16969182956.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/98461788221.pdfIn PDF document text
    • http://staropolski.net/Upload/file/38732726646.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612363e46b362---34755788411.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/0a7ce1e46deda164d133e9bcc54312ca/bijatoxilar.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/6237900336.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/12854324953.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba3958734---wipanujanodopa.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_off000163c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE0 10548 bytes
SHA-256: e90b18ff7bbf9e89f487a6c34efb8ac2968cce94037de294a455cec9b6d66c37
font_02_sfnt_off000193aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193AA 19372 bytes
SHA-256: aa1f96050710a98987e89a46296f09269abe6d527acc1baf106b296986a0279c

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