Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4860df214f636cf…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 14:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a757a4e23798f3760705a279215967df SHA-1: 0b652460018a94fcb04142316212d75f106c7967 SHA-256: e4860df214f636cf22a92c8f08f2bc6f7e6a65848ffced9eff798d88f1f5c245
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable hosting domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or trick the user into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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
  • 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://speed-r.com/js/upload/files/ditanujedetejor.pdf In PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/26601473530.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-5/20210905120037139497.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/wawoze.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/99151930582.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/21891912694.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/vesitojipepibufiribar.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nodoledoromokegute.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/zuwejosupifu.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///63282904974.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/kakefofisez.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/pisumode.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/89102682780.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/44945492477.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b3644def74dd6d409e7664f5831e10a1/20645999545.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/buxekoratamonifefadipofi.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/xavagofogaxutuxidunu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/1a7e6174b0db737c3a0b21fa7328d14a/wonupinagiperipiripomo.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476c0f9c61c---nivimagibab.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/14299465002.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/jitavizikejupikizopifi.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/78438433537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=comic+masala+book+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_off0000ad30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC547 10608 bytes
SHA-256: 20cc8403ec3d97870f45a628b1eeeb9a181b2aed4bf1d83dd718e31b0fa9daaf
font_02_sfnt_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 15536 bytes
SHA-256: 33c7a0a8ecc874276937abb3e47f95b4c1ae14f3d8084d048889ebbdfb4e84d7

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