Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70da4e960f22670…

MALICIOUS

PDF

112.2 KB Created: 2021-08-12 22:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 27abd491b55a5d81d0d07cde5874f1f3 SHA-1: 1c75964e0db82524d6e208583cdff207af090ecc SHA-256: d70da4e960f226700c6fa1fef29a3e410996a92568efacf20354b0411654ef0a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains, likely intended to lure users into downloading further malicious content or visiting phishing pages. No scripts were extracted from this sample, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/87c2be63768e094acbc3a203c7aaaea7/zigixanevara.pdf In PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/56bc00c5bd1330ced9f9a61c32f6f4d9/30318466308.pdfIn PDF document text
    • http://18554080.com/userfiles/file/32814821645.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c71317d35eab5c7fdbf77dbed464c00e/piratobatuliruk.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e8d697139---dajuzibekosumudesux.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/55717120956.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/30a165ff8e521849bc5a421100ecd44d/63404555511.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/1j5u8rh8hb3qgo8ne6trkfhn7i/3265397306.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/18565102788.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607362b227dd4---17171839375.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2eca7a27d10466f3f6b857c2ff47ac8a/laxinozipedetivimanekufid.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/7bdqqkb1k72jjbl50qsk78qb85/nusekogega.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/45116104952.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/zepowidojasopezekebuvus.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/p9cjdgjh65qlj7ih1ple8qjqmp/81135197473.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/vepanow.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7be0b4e76800d2c6683b39f77ecfe716/38604125700.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/garemhfh49qr4gfhihq7u1fib4/kilobagakofazewitobu.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/39323756105.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/jniejqj2bai1nsqd49cuu2d1q3/18757423982.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087973c5b582---70139149911.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3ef9a778d---torig.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/96994865196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cogito+t%C3%BCm+say%C4%B1larPDF link annotation
    • 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_off00014f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16791 20200 bytes
SHA-256: ec39938874ab185f3c3ab9259a0bc6154cd8b7be261a89cad9655fa72f96e050
font_02_sfnt_off00019889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19889 10596 bytes
SHA-256: a847dc94ea89a26ed5d3c67174bb5b03b2006ffefa73d3bce4cf4aa6fc9099ce

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