Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e77d1b4ec277a1…

MALICIOUS

PDF

84.1 KB Created: 2021-08-17 12:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: acd8482adff92543a150d257a9135919 SHA-1: cadba14fbba1423cc63c4281bee46123ccc45960 SHA-256: e3e77d1b4ec277a1f67bb9e4c0bf37958a994ff8714f3d13b86bc390a6f30c26
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, with numerous embedded URLs pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=can+you+lose+your+house+in+a+lawsuit PDF link annotation
    • https://85097781.com/upload/files/87101857978.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/wiwemuxulajabaj.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/60584148407.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/sezojij.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b69a59bdd6---zolelimamugalabex.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1625871573.pdfIn PDF document text
    • http://lactopad.com/uploads/files/5974452200.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63934c4d93---gafobodagus.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2qdmuk0ar2aqikr227c829vg1t/82972703222.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/29316976896.pdfIn PDF document text
    • http://handgun.ee/media/file/61203734347.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160985adf61e4e---bamigumajulibus.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/uto1t6fo7fgpvv7e39ktckk0nj/49903888321.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/30mtc7m2hpt1n8du7lnm4iblkh/66953439079.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/setegezifakefi.pdfIn PDF document text
    • https://www.elguantedeoro.es//ckfinder/userfiles/files/motibowulajipined.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/12381649641.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad44c4678---xosasiwugebaluworonuz.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/77087536312.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092461b6b79e---jenojateguwab.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/t04jlb60fgoj77mhjg587jbrpa/63438970384.pdfIn PDF document text
    • http://3asoft.vn/img/files/xuxesome.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/tatisumobibakupawofe.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_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 16004 bytes
SHA-256: 4a284175ae0b53cf089e9ec9fbd94c4fd752d20f1db1635411aff0149b266d04
font_01_sfnt_off0001113a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12951 10536 bytes
SHA-256: beffdf16eb426c4c3a4a38fbe8cbe28aa2435ed52cd2c260b8f8f99c0dd6b96a

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