Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb6cdb022ee32bc…

MALICIOUS

PDF

88.2 KB Created: 2021-08-11 00:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 42e5764009c1023ea3ea78fdeb99b6e4 SHA-1: 5dd37ae4886a05acb97394a5347448ad603b5887 SHA-256: 6eb6cdb022ee32bc0cb03caa72bb9b41c63eea34e8bff328ed265ac7b0dccec7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, suggesting a link farm designed to distribute malicious files. While no scripts were explicitly extracted, the nature of the URLs and the detection name indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086e5d31a1ce---30652773555.pdf In PDF document text
    • https://abofahed.com/userfiles/file/gifedorijubed.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/luwedosijalorarazejojik.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/56823500359.pdfIn PDF document text
    • http://canoeing.by/pics/files/sifikepab.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/8f9f47950a045990c8353ecce23282bc/41631005675.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/jh56l18avb3djq20fkau0msovf/4903853135.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41ea7b21d---86281847227.pdfIn PDF document text
    • https://stbenedikt.ch/userfiles/files/13389978687.pdfIn PDF document text
    • https://stopserv.ru/files/file/23166275156.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/65918256371.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/61152297100.pdfIn PDF document text
    • http://revtechnik.cz/userfiles/file/tevumesugisuvovuse.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/19b7e44be85b971f7bf1869f3c79599b/gunutuxad.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/5152214154.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c94ea61f8e---toduduni.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ca0f148fe34a2758255b5481cc228bd5/1840849075.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160774b6c1aea8---70499161545.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075437beb953---binujumef.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/15732593396107c8b060a81.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/maxipixovitire.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e282b365---mizolifutamo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d9f29fb3319bb5fd3c699c0633eb4781/lumimamoviturusuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=divisores+primos+de+1225PDF 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_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 18952 bytes
SHA-256: cc3681fd0e2dedb1540f5866f73de7fec1f000ec9a1ee934d8eefed7aafa2393
font_01_sfnt_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 10516 bytes
SHA-256: e2e6fb8cc24726e5bbae69395715ef248b0efe91c1f03516d799793a27f5e3ba
font_02_sfnt_off00013a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1