Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ea479a2c27a555…

MALICIOUS

PDF

68.0 KB Created: 2021-09-25 00:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bef9e2967e31f5edeaea035495c396a1 SHA-1: 338109781f91d1c61ad64d915c2a9614ce63e604 SHA-256: 99ea479a2c27a5555fb5d44bbe227443757e65e97dabf6fabe62cce552c21dd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://explosivedevices.ru/media/file/jibunimikugopera.pdf In PDF document text
    • http://tce.vn/imagesflashupload/file/rukavofu.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/motebux.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614979c4821b6---wutibovudexenexe.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/jaxozonaranatewexusozo.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/rarujukamositidedomud.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/9417270230.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/1354985612.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/dibutefonavoxe.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/vanatosuboxivudazirarut.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/75179295564.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/wefotujaziboru.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/72394162734.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/396333120.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/l1iv2m5tvv1aqvuh8gah7r1htk/29747414968.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/78095406540.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/monozopedimupuralolo.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/5605579869.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f4bd9b25bbcc07be61cff0fd85df21af/pobijufarobofimuduzala.pdfIn PDF document text
    • https://servicenter.ro/ckfinder/userfiles/files/nawumaxikavusuto.pdfIn PDF document text
    • https://medius.sk/userfiles/file/50138410510.pdfIn PDF document text
    • http://topstec.com/d/files/gapufifujepajizimiwa.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/22427493207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sideload+apps+androidPDF 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_off0000ad45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD45 15184 bytes
SHA-256: 038babfbde0007203b1d039f9bd5a50416394be3802c7d10d7dd17c2577ed675
font_01_sfnt_off0000d332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD332 10360 bytes
SHA-256: 4033ed02cc6f68f411f3c0c5a9ba188bc6f9b1b07bd5a26ff263292e295209b9
font_02_sfnt_off0000eaa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1