Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5cc8f1871ac183…

MALICIOUS

PDF

91.1 KB Created: 2021-09-17 17:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 195d7db034fd2d2a791ca368acffc493 SHA-1: ba47f18a8b211f93e97a3b84ad2e8e885279f027 SHA-256: de5cc8f1871ac183d4807beb4cdafb7f6446644d77d9c5f758f12e36c5f9daa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The document structure indicates it functions as a link farm, attempting to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=chrome+service+apk PDF link annotation
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/22268707744.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5ba60e30a---likuxuval.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/39401029223.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/93332863867.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/fewojafusenefejusuk.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/1951868788.pdfIn PDF document text
    • https://onecre.com/images/content/files/12377753736.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/digopulelobejebisalijolop.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b346e46b82---kamudevotozavejeba.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c68e929075---66038228490.pdfIn PDF document text
    • http://unibox.lv/files/text/kabexibap.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/69f22c6d2990b45e4ba9398b51751c90/kalonag.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/28889439525.pdfIn PDF document text
    • https://tomas-music.com/contents/files/58262848567.pdfIn PDF document text
    • http://tchid.net/userfiles/file/7289940063.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/33672199445.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xovevutunipad.pdfIn PDF document text
    • http://cy2hand.com/userfiles/ziborazux.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210907153440_2045638279.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/saxonavijez.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/lowesiruvujiwe.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/rekilokagiwimodejoz.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210915/16317137645708.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 16344 bytes
SHA-256: ee4608130364547a8bbde332002371d8e9df7f337e5af294cb5d9eafb987a796
font_01_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 10580 bytes
SHA-256: 82d121248acd5fbb4dbc169cda8a8275fa0f4f7c9520a4f4aa43ded82d949ea8
font_03_sfnt_off000120d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D5 23696 bytes
SHA-256: 510f84314f32afbab367d5c2b6b0b7556b71ea1e86eed781282624b5949e6038

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