Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec4d915c085a3dd…

MALICIOUS

PDF

62.3 KB Created: 2021-09-25 10:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8cba3e690a39928e7468c225e9fc2bd3 SHA-1: 25c73ef46d7563b986ebb0efbc31c5994c49d32d SHA-256: dec4d915c085a3dd1bb3c276fa4d34c2d7eaca4cda4d0e5ee0f7986fe94e417c
164 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to compromised WordPress sites and other potentially disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The PDF structure and the presence of multiple links indicate a tactic to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4719

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 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
  • 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://huntic.ru/uplcv?utm_term=conversor+epub+a+pdf+online PDF link annotation
    • http://icltindia.in/userfiles/file/vojetabikafijegobe.pdfIn PDF document text
    • http://szpk.hu/_user/file/63568156255.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5fb95fe61---79169009946.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/jotulakelirawedolelid.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/gfdeh83hsglc5spu05o3p8k0f7/favilazexudalomisusodivo.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/24089184079.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/79124159833.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/wuparexipub.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/41432602707.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/888a6784jedgsib8pk6snjat41/fogemitepijakumukuzuv.pdfIn PDF document text
    • http://ambulatorioveterinariosanfrancesco.com/userfiles/files/48825691197.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/30885393034.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/87430557288.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/xupow.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/razagizodupadigun.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/17325489043.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/56063403771.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/pufebikomarevot.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/dukun.pdfIn PDF document text
    • http://netart.hu/userfiles/file/13558117465.pdfIn PDF document text
    • http://czyxchem.com/upload/files/59413719032.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/rogabakirijawedepasuw.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/merikazerutev.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/pasinunodedisurugumalila.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/36999548263.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/nareduzuxajemesaziwi.pdfIn PDF document text
    • 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_off0000b3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFD 10728 bytes
SHA-256: 8f9d62d5862eefa730b9464bde0e0cec5b925898164bbe45f7c81ff816726a76