Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d3927c7e0d6eb5…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 07:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e30bef4c9b449032bbaf3e1340fbc2ee SHA-1: f167e306cb5aa3d396b024f8e5d1f3490f2925eb SHA-256: 78d3927c7e0d6eb585b07be81303803894aa9327def36bb3372b8beb719f76ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://parlagame.net/calisma2/files/uploads/segovasefesej.pdf In PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/9998779257.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/vozaviwarekut.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/75317060394.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388647b490f---ladokewakumufokipupeko.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161419dae1bfef---80401480021.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/80694374476.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/fasufefebopujabubonup.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/16365854756.pdfIn PDF document text
    • https://chineseclothingonline.com/File/pumarisutowanomadixepezi.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/wuxoxadabili.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/kewafavoladuvafiforupu.pdfIn PDF document text
    • https://ikansambel.com/contents/files/26182644005.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86416474838.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/740351148613a84384fa6c.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4ghdq2ad8pqfq411q6aub4h742/mefenuwasediveduxix.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614271ebe938c---dimudazos.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81903d396---xuzodu.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/11504263797.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/detijatigexafarola.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/79764460528.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/xagal.pdfIn PDF document text
    • https://cape-electronics.com/media/file/43011336541.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/84931429034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=metro+2033+cheatsPDF 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_off0000cce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE4 10492 bytes
SHA-256: 6897f83f16314271b10b66ed841256621db0301131e98b3be3fde3d6b9447a90
font_01_sfnt_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 18256 bytes
SHA-256: 8a2d5167e321d0fecfbf04c579578e0d182395ef9a049fd497f77ffb227d468d

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