Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3412d03f0980dd…

MALICIOUS

PDF

86.4 KB Created: 2021-07-17 20:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6feeea20ed5a53a99e8769bd53e7e7a6 SHA-1: 604c5aa3b2a64d102baeaec4e06d1a5b6790c451 SHA-256: 4f3412d03f0980ddb7fb64b18e7b95f824f7038e7c9005b01b3de6c9195e61c6
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting PDF files. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f792437c77b8b067661dc369b7a36619/54000890562.pdf In PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/linolodenawokasoxivefu.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/japiziwifibutedepevuru.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdde34e7e2---gefaluvuxigu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc02318b975---64770691855.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d94d89f0f18---25144732960.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608303574aaf6---sakusudusolofi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac5e57c348---bigiwiwafexopunamo.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/sikopasabidafuvukoreb.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/59872006143.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/49736922a8a6575e83feca2dad15872d/dafoxaxijavaseduzapawed.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/eecc64500adc198242d85b0636a86958/jedijovidoximewug.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afca9a5505---wututuvewuza.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a49a95b36---pilububuwizifabatowarokiv.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/64230289168.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/57570194620.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16098c16ae87d4---39707194602.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a85a7eca8---59327985986.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/fetilijipubovop.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/63319574060dd75b8c49b3.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/42387885987.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/75065ea4158497eaceeedf2a1032b459/14996424240.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/wuvifefukob.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/20676622316.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/mupejegin.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/lunipotitanas.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/59575111748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=six+planets+in+retrograde+2020PDF 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_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 17028 bytes
SHA-256: bb20e7c1b1331456b16bcb2200a125d7d9e6beef77282dc526a8e44034e2a48d
font_02_sfnt_off000132a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A8 10988 bytes
SHA-256: b6a408d969e88456f28750d77519d40abef4f67adbdd0f7012ff70f14e5fd718