Malicious PDF — malware analysis report

Static analysis result for SHA-256 0747f8b3394322ea…

MALICIOUS

PDF

119.6 KB Created: 2021-06-27 23:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8531d4bbac853182a67ad7c1ab6fd79 SHA-1: 479f2d2ebfadf35b0f1b821d7c9c9997e0324b3c SHA-256: 0747f8b3394322eae23231f8f09c1d46182f4df1a694753efd5185175430121d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the nature of the URLs and the detection suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9772

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://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a497485ddc---69864020210.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ced462b11---30753870467.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16072a51c557a6---rosoribonof.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/u6to0utoj2f2q7uls99khk2mhh/70484728651.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fb042905d---17606611387.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b244db245---9357317351.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc6d4cab7e---wovijopopawiv.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/mloi365kmb4urg9j7gr1gl4pgi/35633692233.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/4e07227cb677cdeb4b2246369b1c953f/bafaliledupil.pdf
    • http://vce34.ru/attachments/file/35892828799.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/pipurexofi.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1bddfe9f38dcdec8121a5d90a0cd3912/89028787139.pdf
    • http://fullx.net/files/88563831931.pdf
    • http://zge-led.com/luodan/images/userfiles/file/bepoduberikemaxajadodi.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7f349b79788d0f9ce2ae6e85498176d1/falowitiravelitunib.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c4669a48---97401179678.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/41fc003c186a9cce994287e5f5f95303/42425036089.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b1991fd57182360f645d119b20b1d2e5/xonilo.pdf
    • http://patanamachine.com/imgUpload/files/81179266929.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/wozapibobirujokogajemuw.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a384240dc9f---fudunotuvuvifefemex.pdf
    • https://gadd-asso.org/userfiles/file/nolunof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=excited+meaning+in+english
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00010b23.bin
b93826a5d932efeab01e6a92af331977e678ad2791fc7cdeef472f894e3a4447		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10B23 28220 bytes
font_01_sfnt_off00013ede.bin
624eea5c97353d8285a957db3e6e2360fa5bb60ef85631436d811ea493a3d3f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDE 7100 bytes
font_02_sfnt_off0001570c.bin
51588e15933ad05792b12db840fd7240236c1a5706982fa2828c8289789cd641		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1570C 32016 bytes
font_03_sfnt_off00019fd7.bin
40fff0215254d93ced16aef53959448615a50b91d6d4b2f408b5355aba5335b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19FD7 10684 bytes
font_04_sfnt_off0001b7ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7EF 16792 bytes

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