Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f73ced3361e845…

MALICIOUS

PDF

73.4 KB Created: 2021-09-13 15:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71dfd881e7e33cf1756578dc683f0a38 SHA-1: 4d8cb8fcdd933c379c020a18d7fe3651a8534a06 SHA-256: 78f73ced3361e84557aa926516bfd49b48a54f767ba43373ac65b6d748776660
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6642

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/497d8159571f5abfebafacfeaf2e8642/38703841239.pdf In PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/kutopiwuvalover.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/luvilalanoti.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210912_B3762FF3A8308C55.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210912_B413D62DFB19B6A2.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/59901262753.pdfIn PDF document text
    • http://hueide.com/upload/files/88780550957.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/67294460544.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/bitanupomasuwoxidimuvusif.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/31269879709.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/68158023469.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/fizabemenedezuputamas.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133e5cc81d9d---57127656646.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6969428bf763e072a3a468027c11eb40/76160313849.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3ab93eba36a868610b687cced74f018d/kolegukifo.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/zigenaxapedasufewetedaf.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210907155758529.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/34298340343.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/23121400691.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161339d521a409---16504292491.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/wibidajavo.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/68951783626.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/98349c17072aacfb389653d655f82203/wudodapus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=poker+texas+holdem+live+pro+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 18772 bytes
SHA-256: ffdbb164d7cdac35de6aa5e53d2512e5ae878a4687898357947ecd9c21d09505
font_01_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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