Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98dfe4558652418…

MALICIOUS

PDF

85.4 KB Created: 2021-09-07 13:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f10c2248284bd6b106482e5df6ea742 SHA-1: 2ec0531392171da66c75dcddc8ad9b4bf77a10cc SHA-256: d98dfe45586524187aa7ce52a115dc08ec0f1fb13fb4f00b03e7f12890402d4c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, including those hosted on WordPress upload storage. This pattern is commonly used for phishing or distributing further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/surotalixelalugiwebegeze.pdf In PDF document text
    • https://ipic.vn/userfiles/file/xumimitofirumolutavuxe.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/senofasuzidopep.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf403b708b---24639195716.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1611821e5c03ad---nejuwibemorefisutewuguri.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607258034e292---81511468812.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/66850795853.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/gobiginalefedebogigev.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-28/20210828215323779264.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e136de7c9ac---60264781767.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/lipedomojovineto.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29221d1e7f---runaxuw.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0456d2f01d---10107347468.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/6cec2338ed3b94340ce197ae639c6d06/6081032637.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109031030546366.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/pilaxi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136cb66b271a---80841481125.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b6abb3a613---zivorasaponudif.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/778d84b0fc456d6a176d45c9ff58d1a1/zirepodi.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/kewiti.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/70139752685.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821bc8644b0---22453702711.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ibh9l576fh5lb6jetvqdrghe2h/43022432299.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/xafogizufugozenoro.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/nkb0s0j5jjeqn5kpo8nbl1eqau/vugarojexenefit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ca+basocelular+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_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 18108 bytes
SHA-256: 255b15a620dd6ffc0aa22ae984e663bab370dbb9b562ef493503a668b34ac19f
font_02_sfnt_off00012fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA3 10588 bytes
SHA-256: c439d923bda03bf2e440f74a91bb491b5a524eafad042d8ebfb056df94ea1ae0