Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38c089670d305be…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 03:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a0fd6a786446fc825bead413cb8dc09e SHA-1: 4a9b2ffe6cc8d3f2ed54622010740893d152173c SHA-256: f38c089670d305be9132a0bbf060d1a7375018523d57dd1f947c30692fdb72ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=twas+the+night+before+christmas+movie+streaming PDF link annotation
    • http://murito.fr/ckfinder/userfiles/files/dikikagidix.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/11791339292.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/33603106078.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/29733701215.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9f70de221dcb80fab96446644be7f1fa/matefaranosi.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/piwovizidojebunal.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/tarebizoturosulumo.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449c9166e76---rolodib.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/22182225529.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/fimeli.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/70428808050.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/woteg.pdfIn PDF document text
    • http://vladekoservis.ru/files/15335727741.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/lixilaf.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/vezusoxog.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/77256916139.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/69416503904.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/muguvaxopemularudepam.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///31114660576.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/divubarobida.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/5813623290.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/94841608801.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/5e6hn2ipa6merihi64bvtslv24/87771468152.pdfIn PDF document text
    • 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_off0000d696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 18628 bytes
SHA-256: 70dae2dfb3aa01deb3f24d763dd4b42bb6e57f8ea93387c89c3ee7f22b41b713
font_02_sfnt_off00011f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1D 10992 bytes
SHA-256: 9dd1b499b35360f49c78a9596e01df87963210adcf2602719aa1c12ada1ebd5d