Malicious PDF — malware analysis report

Static analysis result for SHA-256 1962bc33a83ea573…

MALICIOUS

PDF

83.1 KB Created: 2021-07-22 20:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2370cdc98d94b1648f3450e95916dbb5 SHA-1: 0e2601ab784750d1ee4770fd8ffaa4ec48432156 SHA-256: 1962bc33a83ea5731324b02fad33ce22a64774734d1159ea4fda0fa56d08c774
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous disposable domains, many of which host other PDF files, suggesting a coordinated effort to distribute malicious content. The presence of compromised CMS upload links further indicates a technique used to host and distribute the malicious files.

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 http://mamnonlittlesun.com/upload/files/siworavuduvupobuwevudun.pdf In PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zizamen.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/82763414420.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/getoluzupunoboponifudir.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/9b01e1c6f552292e41d4dfacccd9e5e3/61045549238.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/2472276175.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210610_744A6E1B782C73DC.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7291f2dd9---menimolulani.pdfIn PDF document text
    • https://lapiadinafelice.it/file/1919413665.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e896eae47---jelexegulabadewariwifak.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/megapobizibilitude.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7248363f2b---temobepoge.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a3d5df082---tijexerewebabokoj.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/d27406df15d126b8bbce98c057d50ac4/78337283588.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/57ter8obpq4pvlvi1giep22pmd/lubuzuvazavifixerimawes.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/zubizutebovitulisatuli.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/46824107032.pdfIn PDF document text
    • http://blackwingsexpress.com/upload/userfiles/files/70383112007.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/gusipu.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/tufixojetavumivodovoxe.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/27824506f82c299b0c298e32023171a2/61024838829.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/ruditilotop.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/87614552861.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/jimizuvoxurilovorezejuruf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=out+of+the+dust+karen+hesse+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_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 10676 bytes
SHA-256: b055098521b7a2136462f82f88beea71912cef8a37b6c31232df523b543ec94b
font_02_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 17432 bytes
SHA-256: 08ba39d38be6cbc669508a8bacd320a5a06969d5c56716cd34884fe43b894969

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