Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b2e92cb14f284f…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 22:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 977db4913015a0b650772ba4c0997cd9 SHA-1: 19094668aad4426e75deba38a3324dc3a2b69c94 SHA-256: a5b2e92cb14f284fd6b1eddb4cd34bedd83686809ee2967d1007e667feb39e92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, hosting numerous URLs that point to compromised CMS upload storage and disposable hosting, likely to distribute further malicious content or phish users. No scripts were extracted, but the presence of multiple external URIs and the link farm structure strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070c696aa92a---tasilew.pdf In PDF document text
    • https://riminabda.sk/userfiles/file/dimejed.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47591418041.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/96699936648.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a10e020cb---22903440335.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/80325997684.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/g135jpmkpbiupodl576m5o9kdt/xolixasabu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/83aca30b347784a793e2346e09e20fb5/zegemosezukuvenijedotez.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021072813433573499.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ito63amedrrrrnjlitcdi6ii1k/92342716275.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/2f638a4ba7d2d2d87ff907847ca0fa5c/jelijanodizasixutapev.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1e7d22f7f322fa02ac9e4050f01db16e/lenalaxuwewuzujowasu.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/lofukosinale.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098459ed6b08---kedatusizopomasomiz.pdfIn PDF document text
    • http://youil.org/userData/board/file/telipoguvaxobita.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a952e3a8ee4---93017854784.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9l7c8rqig4l917igu6pl7sh5e7/wagefepiwoku.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c6e0c51240e55438fb9e29a04a9210c6/61114885335.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/26172881106.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/gimenajafodetulajagebamew.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/tajanen.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/dotikawumoluwi.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/dka3ql6vu0jgdsamtknmrecqib/85478668308.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160946884e1253---napugogusorunajidobogujod.pdfIn PDF document text
    • http://klinok-saintp.ru/files/75561696390.pdfIn PDF document text
    • https://subded.org/userfiles/file/91985233160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=all+you+zombies+short+story+pdfPDF 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_off0000e600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 19956 bytes
SHA-256: 8f70d7c689acc5031d7a3dc307c175d3c8a6fa939569a52f41d6e4417fdfee9c
font_01_sfnt_off0001181f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 10892 bytes
SHA-256: 780f4c882375e5af407686ac141edef5f531cb81c1149eb17b51e9919f9eeee2