Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f638574c3fc46c5…

MALICIOUS

PDF

74.9 KB Created: 2021-10-04 19:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 69e77faf6d71a27f4ecf60c6b66927dc SHA-1: e0e273270eefc57b5ac050563d7e24b72a0931ad SHA-256: 2f638574c3fc46c5c91c29cc5cc0b938f8806e93bd5433b7edbb220135a6d598
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains identified as link farms on disposable or potentially compromised hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bud-med.eu/userfiles/file/ritumumukovukopalumo.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133492351abf---tisijulolasudodazomuwago.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/33670936139.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161343121841c3---zelofibabaga.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210915204520.pdfIn PDF document text
    • https://media-get.com/userfiles/files/nepomev.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/f8tn35upf4kprcms93cb35pjug/puvigowus.pdfIn PDF document text
    • http://etnorom.hu/pictures/76028511694.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-13/images/files/62836633563.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/37fd346fd0d2757bd1a618b3eee8364e/sadotabuxibiwokemopev.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/nifowo.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/4785657759.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f63e9bb613---13081510433.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/movejegaboloxomiz.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/39531502554.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/33165847238.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/narixodorojosaduxok.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/55686690201.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/pixevibikudekaliza.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161377be302971---97555139273.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/bevodawuwejofosi.pdfIn PDF document text
    • http://nprofit.hk/userfiles/40295857015.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/47045976371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+many+countries+in+the+world+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_off0000c1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EA 11176 bytes
SHA-256: 6d6dc878ffefb21bc30f5c2792c61e373b10428094586d88b7fa2f9092a7a31c
font_01_sfnt_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 16560 bytes
SHA-256: 4c8529512b1466643d3177553adc6ea71c7f5fffb210af7cf58fce130727cb1d
font_02_sfnt_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1