Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15990bb944a6827…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 15:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1412d3b5afa47431c61f8c980497ccd SHA-1: 126b2fe1bd700c06ea18dc446acfd35c7e8c793b SHA-256: d15990bb944a6827613a3211944be0002d41cef673082269497ea2957f8d1c0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://canvangdientu.com/images/file/47231890348.pdf In PDF document text
    • http://escuelasfutbol8.com/docs/files/72033817017.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/25154177607.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52fbe3010---pinelosuxajud.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/woromunizak.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16105b98f4fb10---41027679866.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/rugenuvovizoxuj.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/safoxazadike.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c621145530b---68747663464.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/tedebividudovazosujaxos.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078d51f92d51---kulipokananiratiniginep.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/vupapuj.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/belefuposew.pdfIn PDF document text
    • http://asustainable.com/global/file/1906058804.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/21603530680.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609055fbe8b84---73837746225.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a599335469d---fosafanogepepesapereje.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/32249279602.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/dutipijil.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/97320024582.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210717111930.pdfIn PDF document text
    • https://miet.hu/kepek/34834490037.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/33896908007.pdfIn PDF document text
    • http://nensi.si/upload/file/gusobazerodikamew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=industrial+safety+posters+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_off0000d6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AA 18524 bytes
SHA-256: ea2a79a4b1a9989d466b894478145d34ad4fe1d40c1e175356b6b7742f7d478a
font_01_sfnt_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 10656 bytes
SHA-256: ec66609924e18b5317e22864f7edb8d7c1392cd30645388eef2c53817883dd83
font_02_sfnt_off00011f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.