Malicious PDF — malware analysis report

Static analysis result for SHA-256 b895dc7d666e4aea…

MALICIOUS

PDF

131.0 KB Created: 2021-07-13 21:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb632d1c7f55bfa6015c1a6aa11c847b SHA-1: 3f3661c69c57bac78918f5b2cef1a75a864225c5 SHA-256: b895dc7d666e4aeae706539b1d3b770be8e7d6cf54d9583086b97b8b3a697bb8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://textingrights.com/userfiles/files/71131464722.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c22a0d8645---98975157909.pdf
    • http://bezagsecurity.cz/userfiles/pirimukakarowufero.pdf
    • http://playeasypiano.com/resources/fck_images/3963460028.pdf
    • http://ekonopuntos.com/campannas/file/fukujubitupapo.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3e347d9cf98faba97936e8e3a0a19417/nudilimu.pdf
    • http://vivo-mebel.ru/upload/file/74907439623.pdf
    • http://mispuntossaga.com/campannas/file/4582935429.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebaf60c42---nudow.pdf
    • https://suavitinhtannha.net/upload/files/jazulop.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609778973ec8a---mozawagus.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/d6286a85da80ee2ea82aa762a1fb38e9/33074402947.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/tegotuzabupawudikebunade.pdf
    • https://autoroman-service.ro/imagini_ws/40263903882.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/a8ec89acf7f527ff83d324e947c5700b/98507875293.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/84a6bfed60fd0ac9d9f714d0beaeb1d5/xawotoxumizonukuzoxet.pdf
    • http://akicgiyim.com/userfiles/file/kagisutuxefer.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607139c715ce1---56482214477.pdf
    • http://premium-h.info/files/files/85119303091.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f37d0b20a2---faxalewumusaguladupuged.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb43a8bdcb---faxaranefopujol.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/mtubemne4tneds7negsl9hh7es/fizofomanikanomovetix.pdf
    • http://casaatlantida.com/userfiles/file///sebewozufatisiz.pdf
    • http://byty-pardubice.eu/UserFiles/File/wulox.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/acc73486979a2ecae38ae41ccf1499fa/58736669321.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=apollo+butterfly+life+cycle
    • 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_off00019a34.bin
32fdb5ad67b6e84cd6d5df6a3c01665442362afc285ab6a972ee37d4edd9e86c
pdf-font-stream PDF embedded font (sfnt) at offset 0x19A34 20192 bytes
font_01_sfnt_off0001cd21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD21 16792 bytes
font_02_sfnt_off0001e538.bin
0411d9476d318bc925a2ede31e4d25b458d8fa84adeb216aaf4a93b1b81540ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E538 10372 bytes