Malicious PDF — malware analysis report

Static analysis result for SHA-256 581ebd527623f054…

MALICIOUS

PDF

91.5 KB Created: 2021-08-16 05:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b71ce74a9170fda41eba7b3ffae8fc02 SHA-1: b43687b5d9ede6f0bfa5a5544065ae5b133f4046 SHA-256: 581ebd527623f054a46980dd7f2c41eda7bfa3b412e34c89db29622ec8fda09f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to deliver secondary payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crewmak.ru/uplcv?utm_term=samsung+s9+screen+repair+guide PDF link annotation
    • http://daoltrading.com/userData/board/file/pekogikigarokelotire.pdfIn PDF document text
    • http://sieuthibds.net/images/files/10892658434.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/mizuxaw.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/12cddbf90cbefa9b9f17f8c84ffbdd1e/16028298048.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/bojowufanopisani.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/22513694499.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe47eded181---vofadejikipilibomimeg.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/92438901439.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/s2i9a5jttdg3qdudf5qd9112m3/7007484345.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/negoreta.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/rqieji60bukdcfuh3g1v46hiic/95825584263.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/31545160359.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/40624134805.pdfIn PDF document text
    • http://hzqzg.com/d/files/bimifo.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/36622176904.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/339e6c5ug719avgbtlcn44cig5/73456358870.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/fujupowiramu.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/wotivutifotitokorelipa.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/logixokajirozabitiw.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e15b6a33b3872af844230bc4019f637f/gejoxatoguxixegudez.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9bbdbc000aa5992035983b4ebcb1b291/60128608840.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_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 10936 bytes
SHA-256: c94fc3d8aeb19e643975b975a7a77d4e3b6db57887c054114784989b70f05430
font_01_sfnt_off00011aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 17140 bytes
SHA-256: 037a74fc00d82bf93f7fcd7603825e22eb64cbf96e39b48e9facb3f9f5338740
font_02_sfnt_off0001477b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1477B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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