Malicious PDF — malware analysis report

Static analysis result for SHA-256 19979d3270b6db29…

MALICIOUS

PDF

99.1 KB Created: 2021-09-18 20:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac029293ca1eac7f36d6dde29da9c5f3 SHA-1: 5dbe2ddc9c685a7705d8e562c5cd39e90b3e4694 SHA-256: 19979d3270b6db2916c16744e0c2748191d65c3dc9a2776c361175f2496d70a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with compromised WordPress sites or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://medvor.ru/uplcv?utm_term=find+the+value+of+x+and+y+calculator
    • http://kemenyseprosiklos.hu/upload/file/turajojekadupodiditunefe.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161441170915ff---9622089804.pdf
    • http://transchem-tech.com/Uploadfiles/files/buboduzumoxidodagadigirow.pdf
    • https://soudureornementalelauziere.com/upload/editor/file/fezakisewusofobotasur.pdf
    • http://veterina-naslunci.cz/userfiles/file/41897999260.pdf
    • http://carrasvilla.es/uploads/files/bogure.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/a7ndalr3uvdb3a39bu1go2lch4/fulositen.pdf
    • https://tidurmalam.com/contents/files/58080645252.pdf
    • http://rdmsrl.it/userfiles/files/zivaferagitawe.pdf
    • http://menifee.hanasushichoice.com/uploads/files/tefuselixi.pdf
    • http://icareonline.net.au/ckfinder/icare/files/zewulomesuluwaxibijojefu.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/48705287733.pdf
    • http://mazraeir.com/images/upload/files/11795655803.pdf
    • http://zhizhencn.com/filespath/files/20210909193424.pdf
    • https://cfbadalona.net/ckdata/files/xajedexasaropideloj.pdf
    • http://pokewaveanaheim.com/uploads/files/16900883190.pdf
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/82135783812.pdf
    • http://champaigncursillo.com/userfiles/file/11418705883.pdf
    • http://bukharageorgia.com/sites/default/files/file/58721092151.pdf
    • https://tootooair.com/FileData/ckfinder/files/20210907_CC4BEEC0D3D9F50E.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/joq13upklargss3mtblp3aad03/406402097.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jalotogusibu.pdf
    • https://harkakotony.hu/UserFiles/file/38032830571.pdf
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/45809599540.pdf
    • https://ezokniga.com/uploads/file/7667176861.pdf
    • http://ilksolar.com/Images/Media/files/nupalapufugolejipuzaz.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_off00011ed3.bin
21d46ba1040a496b439f476366fc75dea7330ac7a2231cf35cbba490702c9a2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 18180 bytes
font_01_sfnt_off00014e1c.bin
c535f32b59af57097580b93d7a16e90d17d9e9d2d3e4630872c47f7df8852483
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1C 10764 bytes
font_02_sfnt_off000166d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x166D1 16792 bytes