Malicious PDF — malware analysis report

Static analysis result for SHA-256 63245a865e5f3f03…

MALICIOUS

PDF

70.1 KB Created: 2021-09-24 18:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1fceec1d827cd2d6ecbf5fbd0aad821b SHA-1: 7cdffc0580aeba7064c51c79863dcd7dbc0cd869 SHA-256: 63245a865e5f3f036673b61ba8cf88fe2311db8522ffb8e23102f8a5b1007425
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI and link farm heuristics confirms the redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://inwebjor.ru/uplcv?utm_term=2021+fortnite+skins PDF link annotation
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae5bb47e04---35919788934.pdfIn PDF document text
    • http://yoron.net/up/files/41037556524.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/32616629702.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/lilabenezabawe.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/27715715731.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/12683940710.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/20692412949.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/vutamuruku.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b947999bed---17188155210.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/59534656476.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/vunizunoler.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/33804889290.pdfIn PDF document text
    • http://pileki.com/imgup/file/85223358289.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6143a6984ff8e.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/pakuserepinik.pdfIn PDF document text
    • https://eclearusa.com/images/file/sudubamamowixobesoko.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b49e6c6d46---8945223843.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/zunuvowugamarelen.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/fepob.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/dodexorosavebibilesazo.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/73647436915.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/3467065700.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/subuvezaxelozavarifej.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/pigezejavilupotut.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109171215174015.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/74737416779.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_off0000b56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56A 10288 bytes
SHA-256: 9d90428e8bb999b8919d90a97dda790f87a9b8e8f1da8ec0dd75a2b50a2f086f
font_01_sfnt_off0000ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC8 15052 bytes
SHA-256: f1ca92e08645c85434a0baab0c962163614805e54b125f3c0133a6d1a88783b4
font_02_sfnt_off0000f2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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