Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcf8a7fc00029f5…

MALICIOUS

PDF

86.9 KB Created: 2021-06-26 15:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 40f3507141ff051a2986f99ac772eb7a SHA-1: 9dab0c2661ab942397f54f0911cface83a0fc8a8 SHA-256: 3fcf8a7fc00029f51a0d62b5fed4e9615ce4b09722e6d3e8892826063fa0b46c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious activity, including a high number of links pointing to compromised WordPress sites, suggesting a link farm designed to host malicious content. The ClamAV detection and ML classifier further support its malicious nature. The primary attack pattern involves redirecting users through these compromised sites, likely to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608db1d12b962---suniroken.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f73e66c4---pedijawama.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086a075c467d---44681507766.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/48d3ca97f336ad21ac42640449fb8618/zejuge.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160beeeb80ef9c---xenedaba.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/ruzumunojasanumilowime.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8065ce568---gerokuxasoj.pdfIn PDF document text
    • https://vpntraffic.com/upload/files/25283130785.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210612_412CB8E155419470.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/39948630314.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/0brkncantgr3vat9f3srts5q3r/zewowokikalirimemexodune.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828cb3ab214---44763698371.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/jjfs3218tgs3quvhm82bn823i7/46521670713.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f61c2c0fc1---63742180242.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/10548579455.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/dd79662970a5cd39d99300dd2857a55f/23480985251.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9kekvv8f5so3jbf0heclquvvj4/pobola.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/xugumumotasoji.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/rexuposinufanubujapox.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/dijojezurafozavesevuku.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/29737149649.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160825a5398392---40918999436.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/bbdc8dfd61335bef0f9af8a9da4115eb/toxosagisirelibogiwoke.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/1bfeb759d929793e8464f50d0b335f2a/difuvi.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/th8apsgn84gs8n6qd4m7n6l9g4/kavebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=need+for+conserving+waterPDF 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_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 10732 bytes
SHA-256: a16a8e99cada87d6096f7860bde9cbc62b1520b1fd9a8f2474537d24eba71c7b
font_01_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 17292 bytes
SHA-256: 4c2fcf61bdb92760fdacec13763c335357c88f4e768cb3f6017d0042d7d8e148

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