Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e61cc5558a1a500…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 18:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b507014ec770e876624cc1cd390331a7 SHA-1: f079c49f1bde3501adada914505677df5816febd SHA-256: 6e61cc5558a1a500224fc319e0c1798cb802840015d4c1192d431d8e9eb0a69a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The document body is unreadable, but the heuristics and URLs strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pharmawell.eu/ckfinder/userfiles/files/megojiranipusigideruw.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e0cebe93794---38348600323.pdfIn PDF document text
    • https://chemasan.lu/userfiles/files/matenegileduvotugit.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/15450990139.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/87386754997.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/l7ancpjpppfuu8apctmdg5p30c/xawufixusofilunut.pdfIn PDF document text
    • https://fond.ru/userfiles/file/gatuwovubasanuvawukofiv.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a86418d5d6---tijutenawirubexuvapinin.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/161098c6c32f17---lafefapatatuzer.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/sewerobip.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/51061151694.pdfIn PDF document text
    • https://nicosiacaffe.it/file/33738992549.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c59ed91df039a37c6a2406477ddd5f5a/66038067937.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d4fd7c0ba4cc50b9e4b1ddb1da700e8/tufagapuvujisoguri.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2b782f855945fda6d1bbd0d5e0b43a3e/29945092129.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a210c318694---77783773886.pdfIn PDF document text
    • http://nenorm.com/files/files/zumutepuzulifolaruvi.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/lorawogelekujoni.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/gujarefusi.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/xogobux.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46fc587e7---12539838438.pdfIn PDF document text
    • http://ge-mak.com/files/vaxopuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+answer+diversity+question+in+interviewPDF 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_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 17452 bytes
SHA-256: 687428960e089593b0a722817e3d579f4ca4b92b0ec6782110c781c168592bef
font_01_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 10696 bytes
SHA-256: 431a62f9becb4343b7ccfacc1813b13673fe076ce2d832586b85fcd5be2effda
font_02_sfnt_off000129f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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