Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9c20bd52756baf…

MALICIOUS

PDF

86.2 KB Created: 2021-08-25 09:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c4e94b699f199aa00db269284732c2a9 SHA-1: d8db9119bf0f93571ad061d739addece68797000 SHA-256: ad9c20bd52756baf0f4c91a640b9c8d6369a0ad4083e314dabf7bc0383d8379c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f478ff65ad7c67928025c5416741479a/tuxuzos.pdf In PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/34op01lh806mtebnir6qtfb035/xeloladelutepatato.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fa9bbcee6---39509863735.pdfIn PDF document text
    • https://actor-conseil.com/files/file/foduputevufezid.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/jebidibugimuvozojaxibuf.pdfIn PDF document text
    • http://www.bandungmesin.com/file/felodekuxixeja.pdfIn PDF document text
    • http://midel.me/userfiles/file/82299596253.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/u7oq1l946q5bl1id3ufoeamtnl/wetovoregite.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/94699951236.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/bivafemeladabevugipazowa.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/nunexopilorajiwafafekedun.pdfIn PDF document text
    • http://chromavials.com/d/files/13300300368.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/21880119387.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e33669182fa---16046707442.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085e88709816---66727475188.pdfIn PDF document text
    • http://poultech.net/d/files/68476552466.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d504335d8c0eb5ed51ff24b4c80aa9d/25021664190.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb408f0edc---zibomuxaxidokarabimimun.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/doperuja.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/s4ol2gtjc76jrpc25r9mdfb9b7/vizenev.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0997d76c1---madajomorejuxapabog.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/61945397505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nylon+66+chemical+structurePDF 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_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 10856 bytes
SHA-256: 986292cad8a12847bd3deb109c6ee3b5682bf6a9bf868249dff0090438fd6dcf
font_02_sfnt_off00011d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 17376 bytes
SHA-256: e7f0c84ba8c4552586f24aae943706b14fd7c61e9c479fc1e5d64693f5001630