Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8abe40dc2fb4a6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 14:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5830ffeb24f119da7df95dd88a64a27e SHA-1: b23f2bd5fc6bcc6d77963d37c122d24859bd13aa SHA-256: ed8abe40dc2fb4a6bf98733cabc5d6c8e96f5010c3c75cc070c259b58e30f2f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these URLs and the overall detection indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=my+phone+keeps+touching+itself PDF link annotation
    • https://melnikhouse.com/userfiles/file/21207361957.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145733d667fa---82621764899.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/11627378639.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/fetafamevejebabekofon.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/kinodonuxa.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/71748911421.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/nimijuliwudovajog.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161350de41d822---gedudalapufipase.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/3397540765.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/zenemugelonarufuro.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/wuvalexulutivitedodove.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/83319816965.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/posamasopupijilukutisux.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/bisujafil.pdfIn PDF document text
    • http://kmsenior.org/file/files/jubaletuzusumaga.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/80543757718.pdfIn PDF document text
    • https://vpmemorial.net/images/file/44221035572.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/bavunomubupexobefedum.pdfIn PDF document text
    • https://alev.az/userfiles/file/11016341663.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/23639126928.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/65056167923.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/2320896360.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/99490695393.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_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 17392 bytes
SHA-256: f417c5437b8f4c47fca810683e04b7f4e2cbaa08c8b68033a0eb03be38eead8c
font_01_sfnt_off00010c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 10796 bytes
SHA-256: f3d6fee44bfc7f62c8c3833517f0e58fea4336a372c94314f642dc357fe36028