Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7e8b75da9bc257…

MALICIOUS

PDF

76.1 KB Created: 2021-10-08 17:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0b2168cbf54329db27588fc9864cbe34 SHA-1: 87e02ebd057122e99790c47b286a48c75609a872 SHA-256: 8e7e8b75da9bc2579acecbb9d47b997e595d5e33ba756f60d0e6ea83f2c76182
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it's part of a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the final malicious destination.

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://queure.ru/uplcv?utm_term=wash+bed+sheets+on+hot+or+cold PDF link annotation
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/95793601bb2ff4424f9de51c162f1211/lokemaka.pdfIn PDF document text
    • https://zufiks.pl/uploads/userfiles/files/54904094863.pdfIn PDF document text
    • https://dcimx.com/files/rolivat.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/sinuwalofejipefid.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/bimeledawas.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/89055702678.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/pewomurarezexawugup.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/joxajovekemeretoratato.pdfIn PDF document text
    • http://reopen911.info/media/file/likagigurelevifefaj.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161489b4a3e03e---posirurobonon.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/dejodabapigaz.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/fitew.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f599ce285ebd52e4ab6f9068fc17ce14/witekerifegurasiko.pdfIn PDF document text
    • http://519pf.com/userfiles/files/pujexejatibut.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/fupokakofazug.pdfIn PDF document text
    • https://x-software.cz/data/file/rerinovazaw.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/xitineveperi.pdfIn PDF document text
    • https://viceda.com/userfiles/file/dufiza.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091516272754.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/87981916624.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/604ad2d906362ac693eea9b1b274437f/berupepitosumadidometugaw.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/nibomefolazisuxojejo.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/35274900188.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091414121834.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/doxoxalofupatujunawozif.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_off0000c8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 16440 bytes
SHA-256: 64aa5564cafc98c12dba581902794645d73570d254442fc6684d0273c9d4d637
font_01_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 10508 bytes
SHA-256: be255586ada641f328108b9cbde67ed1042421fef155a7774402d65c1bded931
font_02_sfnt_off00010a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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