Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c4318260fe5729…

MALICIOUS

PDF

92.2 KB Created: 2021-09-19 20:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 73ba6603f40d3a194e553bbd89be496e SHA-1: bc6f4bb4ee6687ea0fcba90c6d54d2bc681c9302 SHA-256: b6c4318260fe57298538e15ce53a897c20233e3f823ab005627c0ca99970dda5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The ClamAV detection as Pdf.Phishing.Trojan confirms this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://drafthe.ru/uplcv?utm_term=ballerina+2016+online PDF link annotation
    • http://marcelponjee.nl/ponjeefiles/file/mupokuwosebododetoruxoded.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/xukolorigilinuxosujitajub.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/komovokiregopa.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/mobaz.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/jonebigitagupalap.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/97767765126.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/dirali.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/tukimi.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/ritakobiwuvojepif.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/30127313584.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/sexevirebifadoron.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/dazoganutugebabisiguwal.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/fopesebufisowapulebuwove.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/1659277148.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/guvirejisukekixezomi.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/503788450.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/87375229983.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/pehhls276mm62ndrdql8mgmms7/19503505752.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/77245986340.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137671298dd5---zurofotekuzux.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/pujibibobon.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/25733070188.pdfIn PDF document text
    • http://phfamilyrestaurant.com/uploads/files/kerubiguwimifujegijikesu.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/bugorenilosalivagenodu.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/69079744483.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0omnb2bi26ckc479uqnvrn142a/xotodipub.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_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 19052 bytes
SHA-256: 572ecb0b039c0be8e0b280fcdab6ebe79ba071a644c27499bd8cfc6059542017
font_01_sfnt_off0001337d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B94 10352 bytes
SHA-256: 4f4683ddf561d662a954282c771839050ba0f19de8f527f2cc9f17faf29ea326