Malicious PDF — malware analysis report

Static analysis result for SHA-256 720c5cae7883ed64…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 09:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05d6dc41e23d3cd14abfeaf4ffe1ea80 SHA-1: 60c70bfead0de77f174b0d699503510a4f9c0dcb SHA-256: 720c5cae7883ed647889cc07ae4360a90de4c181ffb73964caa58e87c4f41fc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=setting+up+my+firestick+4k PDF link annotation
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/92980619757.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/74559986033.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/8lba9hotiqqhace1q0fvsb2p32/filij.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/40778522811.pdfIn PDF document text
    • http://szm.hu/userfiles/file/fazuzunarafozasozidebew.pdfIn PDF document text
    • http://effekt-film.de/files/file/vazokopegezokamejovije.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/weviratoj.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/lubesoxuverikigukowu.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/venoganenovomofufuzew.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3bd6d71f50e044c504e5cdf61509b265/25949820879.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/juvemag.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/53441998375.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/2220142212.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/kirofeto.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/77749383234.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/faad2b1909cbeb6fd004e05a615f5383/93154759746.pdfIn PDF document text
    • https://qkon.ca/images/file/84187970603.pdfIn PDF document text
    • http://mosjob.ru/images/file/sejotaweku.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/9012985193.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/nelovapavukakunimatiwev.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/weferimidetumazogokutexar.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/11676851806.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/4085058578.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_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 10956 bytes
SHA-256: 610f7b305a306701794affda283a2985cbd855f98aac00c63cb34f471f601126
font_01_sfnt_off0000f589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF589 18352 bytes
SHA-256: 54819e3d65acadf7881565b6563a5e17945fb66c197273971b1dc793400cbc19
font_02_sfnt_off00012560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1