Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b270b3226e257f5…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 11:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c511fc9bb8811b845eca77dc8ccd36cd SHA-1: 21da124104c2cfb781b8a6e7eddfc7a71ec1d9d8 SHA-256: 2b270b3226e257f5fd4abacbd45d8d1a722814cb9c176cf5ab5c650ca8c768e8
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress sites or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=yaris+2013+manual+harga PDF link annotation
    • http://hotararicedo.ro/files/files/valudaviwugo.pdfIn PDF document text
    • http://progetec.org/userfiles/files/26112324546.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/7463202991.pdfIn PDF document text
    • http://sbairs.com/datas/files/wejovudawored.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/repidavorezifakab.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611fad65bd133---sepizipopigarujexurisimi.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/f38be7e60bdba7298568c4818274c2ea/felefajewavelegotazoxujaw.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f632a7c30---tatono.pdfIn PDF document text
    • https://777mto.com/contents//files/fovasatosefuwokutirul.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/89812538983.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2cec6b2e59e8885d380e5ea95bdbe9ae/bisufudofunepa.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/0rmfdlsbohc5hat415mruhch91/sonowes.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/da33b15e71f2f4b9cf3c30ca9ad89a30/jiwejagewuxejeju.pdfIn PDF document text
    • https://argumentua.com/i/file/45247409929.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2817e8740f---tagobejusimibasibijaruxu.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/883c9e91613aac471272b6d44425fada/rinezoxonanajiduxino.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/3cf655e996645df24996578a0c012e9b/16616408392.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/12728178184.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/69814563810.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/4575559894.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/7483244198.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/dc6749f27f0aac23b7107be20de1c5ce/jomoseredobunawebivijujo.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9254047190.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_off0000c8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D5 10752 bytes
SHA-256: 2805ad16f303e548357c59e27efd60ddc281b1c99824a84e2886ce07a19528b3
font_01_sfnt_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 23828 bytes
SHA-256: c313d0d289d690ba51a31702356a4d74a60668d876821164511b8c1af4a20711