Malicious PDF — malware analysis report

Static analysis result for SHA-256 238bff1cd8422919…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 20:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b2a9d491484c8f8d5a24239552c19fb6 SHA-1: 1e1d5aaf4be57a2ebe99d25c8ad5869e67422598 SHA-256: 238bff1cd84229194adf5c1e75cb64dc7dd377a04dfa5a040032966ee7d23865
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting. These elements suggest the document is designed to redirect users to malicious sites or download further payloads, aligning with phishing and malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=battery+saver+mode+android PDF link annotation
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/juxidufexexagazenik.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/momosekit.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/bewiwobekop.pdfIn PDF document text
    • http://agilesolutions.in/uploads/96862938500.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/dejofuxubuwokavibufe.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210913222007.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/fb1bce677ed4c4fb87f6b684ea4cdf71/31694569274.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/43805350213.pdfIn PDF document text
    • http://qwerty.pl/_data/file/77328962454.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/tirivotivivunejodulog.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/eaa1b36af7803230a98971f5cc91910a/pinijijokuzod.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/82791705243.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa19b700c---rofemikobib.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9ti8tkhnal2b3u89vm9fmf73k6/51063602456.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/xezaluranelitizigimuvokob.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/galurusitexaraxupamebuwo.pdfIn PDF document text
    • https://mmtours.si/uploads/gitefedixer.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/nobirifufe.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/3401249441.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/84801700821.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/pajaweme.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/xoxafuduzodupubirive.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d9c3e876424f5a46b23a48454123086a/85814858098.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/32841476438.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_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 17692 bytes
SHA-256: c650905965a748b13f7aa9341b3e7abf49ff426e24565d3fa37e7db8d5223473
font_02_sfnt_off000123d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D5 10596 bytes
SHA-256: f504f2fd9e425d0bffe9c9b7434b81655de4d3a0f932804500fa5b9b7a6ac085

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