Malicious PDF — malware analysis report

Static analysis result for SHA-256 4508d78284321d0f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 08:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e0da3da060f1b253546ca5e31bee3e1 SHA-1: ab3b652e6493b904c9c64d4521360a75d280a7c5 SHA-256: 4508d78284321d0f294971bdcf71511a06e9041f9c9e46197b26199835a7043e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://skncn.com/u/files/gajam.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d7284c557---78296126140.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/zeposujopeweguj.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/54009520359.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/56631981522.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/jobewazumugunazoz.pdfIn PDF document text
    • http://kd-council.com/upfile/files/24090565285.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/patakiw.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/dujawizutu.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/guluduxubalibawilug.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/98595353375.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/117177928.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/73880507571.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f40771601---95613841310.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/59723863205.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/da95f326292f77000aae09374895b839/70220279276.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210911181008-xukugefa.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/korasodanozetaludoraka.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/kagavevofalasova.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/13c9332k5cnrh6c0nvuumt41gr/rujufesulonagojemo.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/66967127925.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bee83db74a---65607871020.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/79761330178.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/56054766536.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb4264ded---tifepifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+android+app+store+calledPDF 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_off0000e22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22F 10604 bytes
SHA-256: 1d21b4708f46c1d12d6df00429346a87bcfd766b5a075a784bf5092189baf7ee
font_01_sfnt_off0000fa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 17608 bytes
SHA-256: 1eb689b84c6c36f11ea4d89f664ac67a9bde55a50ee8423b2d614e64c9f334bc

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