Malicious PDF — malware analysis report

Static analysis result for SHA-256 96a9a5538e7abb21…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 09:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f3507d7e0b74a8e09374958437b0f59 SHA-1: 1c58f5f47a836a190b50092767bc021666560a45 SHA-256: 96a9a5538e7abb213f2114fc0f6c8b1108aa720a96b32b00c24daaeb8b73e231
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and compromised CMS upload links further supports this phishing and redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=is+clase+masculine+or+feminine
    • http://snotlicker.com/clients/10243/File/gewagisutulumodufobetuki.pdf
    • http://skogsformedling.se/bilder_umeny/File/vufukagozabefov.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a03b99e0b1---51074743064.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160726dc501071---ludixisese.pdf
    • https://vannordenvastgoed.nl/userfiles/file/wozur.pdf
    • http://merlegdoktor.hu/tmp/zafujigituvurawawodot.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081391b00ef8---64559119851.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce89c57307---65472578578.pdf
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/24672809810.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609495e0d547f---vofazevixanit.pdf
    • http://gerocuki.hu/user/file/dixozume.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070985b1c060---mepupereroserutuxoromulus.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d4af21a0d---majuzovokimipubomov.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a69192f23---donofeloza.pdf
    • http://pechati-piter.ru/userfiles/file/xeguvasumeribekuda.pdf
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/84795523028.pdf
    • http://birzebbugastpetersfc.com/files/file/42782679701.pdf
    • http://onnetsolution.in/userfiles/file/bixaxosekimuwusumaf.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/ea7f8261e5e38d27b1d0b022a8da66c4/38520571871.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4b642dacf4f0e180750bb60b09a5e6bb/viximolezoris.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a5c0883bf---vetujoba.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb36d2fc78---marimeripaj.pdf
    • http://movementlab.dk/userfiles/file/noporedulozikuwufa.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63d6eb67a---sovuvejupenodape.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/8046a31a4987b88929dea03d8e7198b8/zagigedubixiw.pdf
    • 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_off0000f003.bin
d8a25e7acc1580220aeb936f29176830e807ad97455489c862b311344fb9955b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 10448 bytes
font_01_sfnt_off000107ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107AB 16792 bytes
font_02_sfnt_off00011fbd.bin
87258a5d63bafaa7519fad1159d4d50af40b9091c9527634c89db1b349122c97
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBD 18420 bytes