Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ecbfadf85abb36…

MALICIOUS

PDF

89.4 KB Created: 2021-08-15 16:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f832d0055ea5c312d198fc01fc4a3093 SHA-1: 82802ece334d3d9fc7dde82fe1b693415c56f348 SHA-256: d9ecbfadf85abb363ea898b4b998963e728a3be609012e4cb1d6fe854b4a8aaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://starke.ca/clients/84205/File/64022657439.pdf In PDF document text
    • http://on-video.com/movies/movie_data/file/mivunapoxebabosobi.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/bawaxuwizasipu.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/wubomubixegobazejanaw.pdfIn PDF document text
    • http://sooclose.eu/upload/File/rasuxiruxemujudatil.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf47187206---bubebapeselilanumedetove.pdfIn PDF document text
    • https://areicon.com/images/file/paxiwisifu.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/9e0971c15026e6c454f5e5ecc3a3efa4/65071050147.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/jevemeporokifovefu.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/jukomapalerijewoboni.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/dc06009c124d9ca75e0bdfe0ca7df580/46536749128.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a782856fb1c---70597797824.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aceed31edc---sizakirepavexe.pdfIn PDF document text
    • https://migger.dk/userimages/file/65612755890.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/i979cprdep08ri8hesboch9sgb/miwaxakafawowi.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/62879124537.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/jebotaludepupomulafak.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/19920302077.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/depidokitimu.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/dafidumijuwemipunisuzod.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/13278434568.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/firovase.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/zolodowizoz.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/19811995656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=general+knowledge+mcqs+with+answers+pdf+in+urduPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 16996 bytes
SHA-256: b4e94786b6543ed9a2edca90918cd20ff1058f79ba2434f592a2cd3ed8c971cb
font_01_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 17624 bytes
SHA-256: acbb6b66b6d5c5a7917f9136b823b58523ee0c0ea258edb621e0a2231b5dc880
font_02_sfnt_off0001220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A26 11528 bytes
SHA-256: a4819d3199a1be49cd26460a8284341c7e519b4ea972659fcb18cc3c7412ac34

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