Malicious PDF — malware analysis report

Static analysis result for SHA-256 e424aaf7fd06bb58…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 10:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2e4be407fd0d539b542bcd489ac6f5fe SHA-1: a85eb498038c80a5fb49e2b41f0164fa11dbe61c SHA-256: e424aaf7fd06bb58023bc3f2ff3cc0c9c5fd874be5b2b6eee969ca4dd4c7beee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to other PDFs hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

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://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e89a6b22d530a69e7a19e49dcb3a4190/kewisadaf.pdf In PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/982d963bd2982d6b61e12186a6bfc798/lumiraxorokarasavobutus.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607573dd7e812---zemozor.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/39305990295.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/belipigozivibi.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/futokumabokubope.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/78347745350.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/61510723599.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a730b1f0a---buxudevofupusujurekerifo.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/kinavugifotixivuxijusopif.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7414d411c---fojogejet.pdfIn PDF document text
    • https://goodline.by/userfiles/file/vabazokakokeluponumulotu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ca711ec19---ledimezu.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/ledonotoz.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/dbd36d4b9240d6f395d6cb6f6ba6a7a7/tidexanejifavugifim.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/k2cv6k4qd6dl5of4epk4ic83o6/suxiruzejelurajuva.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/37481178875.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210808124422.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/ruwatusuwavokigenatenal.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/morixaluwijukesa.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebf11d421---52092490240.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b72d3c3f835---99826791841.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b523dfcd---44663242349.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/netawitoxubid.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/61683982287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=measures+of+central+tendency+pdf+class+11PDF 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_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 17404 bytes
SHA-256: ef72f9caeebacc6360fae04f6c718fb948d026d981e07da5e3c6c8aa9f1eab77
font_01_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 10780 bytes
SHA-256: 87f20f1905220f5457afede5bac5458e98f0e2fcf5cb0b03b9d3502e157e149b
font_02_sfnt_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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