Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7acf6148744ffc…

MALICIOUS

PDF

84.9 KB Created: 2021-08-14 15:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2db93f3264e2986c1e1613065051f845 SHA-1: ae9ed761c12016b101a868249d2112190c4b7f63 SHA-256: ff7acf6148744ffcc3bca6ac7fcb0fce22a287c601721ec92a87733aee0a8cee
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the extensive use of malicious links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://lescourailleurs.com/upload/editor/file/desoniga.pdf In PDF document text
    • http://tpdw.pl/userfiles/file/635834272.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/nqh0icgqhelrvcoos4fn6hmrg7/gixolupugedoni.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/59723421415.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/65121898359.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/83344478075.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7funavo1k3479k4v7f3qhbq1v0/43149671623.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/1275220476.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4d91c0be5a13899a2fb6770714a7c875/kufalexasekip.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/qal6dlvvs0c66b6ahvhhgdsg2l/sazuxiraxuneje.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/nefapexinoda.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/823cd66b9eb637b18163dadfb59d5e72/davutixuwilisu.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/mefemuxuzexexumaxadur.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/47140427349.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/20764519958.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a44f988b06e---32442795840.pdfPDF link annotation
    • http://www.herbertvanderbrugghen.nl/draft/tabitexawelarojujo.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/fusupotovodiwodem.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/10477224214.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5a2bf413f---5345360341.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/bca0f0958c1bd445b971c4d5d4ddb278/junamiti.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d73472eac7a---82839472207.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/jabexesesiguwekujoza.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/bitalatewexapotuwirozude.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b182920ca9d---48261606485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+use+the+torque+settings+on+a+drillPDF 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_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 10852 bytes
SHA-256: f493eac13fc65ec0a68d817ae46dbc49518a77f446d8b99ecbf3678656903793
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 16956 bytes
SHA-256: a907a3ffd726b0e9ebbd1d1b63fe165229319c4891b6233061ffdefa22e3f0d6
font_02_sfnt_off00012df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1