Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5884f180bb54cd…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 13:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 674ff96191cb40786cdad98701ca5308 SHA-1: 20452a2884f264150fc3d2274e8268d03dce7996 SHA-256: aa5884f180bb54cdcdec431072a24e6c74f6faa6a4bd3da4413d709ab5504e00
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL targets are highly indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://yasaitogo.com/uploads/files/wijubilo.pdf In PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/rutanivawu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610350f2bb067---wogikovolev.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/notemezozi.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/3e20d673e984cd39531cba9d409d8845/luwajeregegujinomidatope.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0281d7a6---78718310207.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ef6d56651---84591413427.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/nabijikesawe.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/kufufegoduvat.pdfIn PDF document text
    • http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/vuvutezelesinewixanamuzu.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/towiledimimuzisowezoni.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/jol4d5vtdnsv475q6l095n6s45/88708704479.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/tipefukorelunu.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/11287254487.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/31073260312.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/42161811422.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/tuvoxuzefizojewo.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/58500999826.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3541feba9d---33474152895.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/910c8076ad2d53014a8624d1c3c9ad07/nafafuwemogofo.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/18228298128.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/zuxotogamuvusiz.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77635988575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=maths+magic+tricks+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_off0000e23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 17652 bytes
SHA-256: 2c696a966d6c9c7314527ad9bd6697e86a42b1c19b67195d0c266f016fe4b766
font_02_sfnt_off00012828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12828 10752 bytes
SHA-256: fe15482fbdabd6ee1413dd0f153ca02f3c063c0567d036ec8b1993834ea5139e

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