Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dda4b3e68599f79…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 04:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fd7aa6d8d2ab8d93b2cb1cbbf58f89a SHA-1: f01490acfde9db0ded91d688c6cd7b3b26dc730b SHA-256: 6dda4b3e68599f79c2875e9b12c22793633ec09df804a34d2be45f65c41656c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dom4m.de/userfiles/files/kekidojizezofoxebogas.pdf
    • http://gcsiva.com/files/userfiles/file/tunalos.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/192j5s9dmdif7ed52rpagb4h6i/3865005749.pdf
    • http://www.gamylai.vn/uploads/files/wekusasenunun.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/m7c1pltnov2ro8nfs0l2lrqrev/14281114094.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/kimosifojomewizaxusozud.pdf
    • https://getadoc.in/ckfinder/userfiles/files/38605501636.pdf
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/sudobebibisane.pdf
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/70223272879.pdf
    • http://phdpecs.hu/userfiles/files/91476534426.pdf
    • http://masan315.net/board/imagefile/file/pezivefaramifex.pdf
    • http://df-2.de/images/daten/file/povabasujaredupexubixowe.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/83332783737.pdf
    • https://777mto.com/contents/files/13484581644.pdf
    • http://autoscuolauniversale.it/userfiles/files/jojuluzojaxijesepeb.pdf
    • https://ambalatender.com/upload/files/vunegutapifaribagevanitaj.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/376c40c37898d91428a64987d443974c/lidal.pdf
    • http://ahjygjg.com/upload_fck/file/2021-9-18/20210918155421687353.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16136cffa1e5a2---9475000416.pdf
    • http://yanarfabrics.com/firma/files/rorosu.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135189850908---wugirezeletitusoseme.pdf
    • https://cupanghitam.com/contents/files/raruloz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=200k+bloxburg+family+mansion
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0b8.bin
7f4544fe1150d563c1620effcce691351442812b057c571adb4c4051cc03ff4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B8 11020 bytes
font_01_sfnt_off0000da58.bin
5bc512ad74f102b976f4c879869b8907aac3dd0451e3a3c171bb4aa3a53d3976
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA58 17544 bytes
font_02_sfnt_off00010870.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 16792 bytes