Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d76b2c1b72998c…

MALICIOUS

PDF

89.1 KB Created: 2021-06-28 19:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11c2653dbf056156ffb36503ff963b06 SHA-1: bfe7ce1b6d3699c32ba4d85e4bba4b9b9eba1351 SHA-256: 33d76b2c1b72998cf7dff231a859aa57744fe050bc100d73a8a3416b30b27cf1
156 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics as a malicious PDF, including a critical ClamAV detection and a high-confidence ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content. The PDF structure itself appears to be a link farm, designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b78af687c36---bolarutumikoteveju.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b06a305a9---rabokabasu.pdf
    • https://colakcivi.com/userfiles/file/livokepelakikemazegef.pdf
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/62110433344.pdf
    • http://ttccid.com/userfiles/files/49266556958.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ai78h40vadlmj6i3dspg2f5p8s/65832514193.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e45c03b513---juvedoxiv.pdf
    • http://learningkey.org/userfiles/826699027.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/815b977085c622ffc5b05b3846dac23b/wixepukedovanoxalixisip.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/73e16818818828e936e76c8f32ce5bbb/61270487208.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f046ed2289cfb9609807f8f602190ba1/4259364609.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b956f2c2f57---37420898877.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607157c443f6a---mapusunera.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/02065ddd45b7d37629d208a40aeacd4b/28829776890.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5a2e1b5fdb956057a9d98a60c4c5b1e1/98240278247.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a5e9cd9c5---88986116021.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b595f436---39488889490.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a237f5312c---30966045604.pdf
    • https://simplehome.ro/ckfinder/userfiles/files/razix.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084337218775---lebelesosujumitusir.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ildbc45gk0ffm7s0ra5f5nir62/91265997801.pdf
    • http://anandtouristcorporation.com/uploads/11221781577.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9f2894356---porefumixipivaburaletum.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/46594411291.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/gowunufe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ford+owner+manual
    • 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_off0000fad5.bin
1a624d2b9c2e1dceb247711dd8d164722108a8f7ecbc110282f989f141d2d59a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 10212 bytes
font_01_sfnt_off000111b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111B7 16792 bytes
font_02_sfnt_off000129c9.bin
3e4c0ab41021cf2838d4551f05fdb0429c3d0a81c9a1ab1419ecbf7a92dcb6a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129C9 17452 bytes

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