Malicious PDF — malware analysis report

Static analysis result for SHA-256 24392d19765ecd74…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 19:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: badd7ba856b219af6900b2978edc2c45 SHA-1: b3827413fb860e51c1744e09d0f8bb5dfc59ae24 SHA-256: 24392d19765ecd74cda2b887d5bc99065ca7e9e58691f9062d4671036ea1fb84
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://adamslakeband.org/userfiles/file/62918813963.pdf In PDF document text
    • https://maintogelonline2.com/contents/files/doxopidibudana.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/76542858358.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/55697151655.pdfIn PDF document text
    • https://partetesal.ir/data/file/misapadeza.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/24820358409.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/10775185618.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/simovesigesolu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614432414c733---sakikiwawukuwutafosuguvu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dhe5je8gqn7of6nv9dm1m2ikc3/20304090496.pdfIn PDF document text
    • http://abnicum.com/files/file/fidijodawozufag.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/99447156439.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/lajonivofisizikidafid.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/42902009679.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/gomasimubogazudufarexa.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/77286220004.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/firisifademeviniliw.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210901_DEDCBDAD7030E5CA.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/85903587509.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/81839532957.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614398b44ddae---pojelo.pdfIn PDF document text
    • https://teamcode.net/upload/files/16676610483.pdfIn PDF document text
    • http://jawarakreasi.com/file/votoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mario+kart+nintendo+ds+romPDF 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_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 10448 bytes
SHA-256: 4e85ef27d24ae86d9da697aab44e0bcc98983bc081fccca1de92f8a4f8341ba9
font_01_sfnt_off0000f859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 18588 bytes
SHA-256: 5111a5054ec8c1bf4bcb9f5f17cdaa0609b9bd6b0574cc886475f37a2e2b042e
font_02_sfnt_off000127fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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