Malicious PDF — malware analysis report

Static analysis result for SHA-256 4222eb38e32c34b2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 23:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 59f3f4dc1cfe2563ab681b997e70a731 SHA-1: cdedbeb5e6fb759149759191550112e80b56a7f2 SHA-256: 4222eb38e32c34b2074560c4325742403fe10631ed33c2826a54e6610e648b23
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly show the intent to redirect users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://lesrimaudieres.com/images/uploads/file/wiwikuzadarobu.pdf In PDF document text
    • http://zovsh.com/Uploadfiles/files/radonedoxifupe.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9adaaa98a9---1076479583.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/30992272663.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/nekuf.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e6a65ee16b76522bc60f0a9360e91874/6525041383.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/o9tkoubs6t8p0m90rk5culeo2u/zobuluduwufulubafekuv.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/taxesi.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6dce8299---2864248224.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/66341117802.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608874be5f0ef---69183318427.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/fujikunerulud.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/gutiruziduzetofoneviwa.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/saxugekewiforokejegofulap.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/50d4c7ca45b2ea85198b9f957970c9dd/tikebenisibunagifebonimuk.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/senolozutiwewiraxeretej.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d4bab42b8---rosijotevara.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c582ba39a---zidirebinatabitanike.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160860348c8a1c---35063869382.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/vuzive.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202108250057109499.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d9aee971---88012015345.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/gutusutix.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/vevegaliwejolimilaso.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4122d4704---80401937017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+chess+games+of+anatoly+karpovPDF 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_off0000da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 17304 bytes
SHA-256: 94d0a92638d3959b2c178f291b6a62eb6225bb9a871e7cf01aeb21c2a8a6c73f
font_01_sfnt_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 11072 bytes
SHA-256: 33a6e3938d341d98a67193b0b8a19b5aecbdbb473c5f36cc14a65e7dbb3597aa
font_02_sfnt_off000120a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1