Malicious PDF — malware analysis report

Static analysis result for SHA-256 7481d6115bb631a9…

MALICIOUS

PDF

83.7 KB Created: 2021-08-25 11:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e8e7de2c5de354e0000387659fcb44f SHA-1: f7de691a6f266dc487896e8edcdd4b49c9ec8f58 SHA-256: 7481d6115bb631a9a732355f3aeb3261243dc20b280e681111ef3d9ad3fadcf2
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDF files. This structure is indicative of a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/2bcuo4c5u0du1v4lgnbmkmif24/nuvopigorajofufo.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e92c8158a46---taketema.pdf
    • https://retake.dk/ckfinder/userfiles/files/mudipolatuvulujonu.pdf
    • http://hoanggiaphatland.com/uploads/image/files/luvod.pdf
    • http://www.thaiboat.net/image/upload/File/53838518174.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ca3728921a13a322182bf6e080791e99/gubosezobaselibud.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/r1ftk3hobd912d9m0nonm8td7i/dawaxiguli.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecb137d599---wupipesu.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc81b21b3b---26541139278.pdf
    • https://activepymes.com/pub/file/tuxuxebuduru.pdf
    • https://mpksieradz.pl/upload/file/72943057732.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/kj03irgrt98uo6ooe0gulq6n9a/58233517324.pdf
    • http://tcihk.com/userfiles/fafaxebujug.pdf
    • https://pui-vital.ro/msg_media/file/dugetupijojapipiro.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b7e560928113b38c441cc3ccd8195a3f/dekogedivijigo.pdf
    • http://asbu.net/uploads/FCK_files/file/kunijoridotugumabafo.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/63326859618.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f64894610---mivorojasawademasuze.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1c86cc8e8c9a760d7960b53d9260cd27/50487159285.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/57bed7dadcfa0faa44df3a2788978d0a/89123712486.pdf
    • http://bi-acaovo.com/upload/files/gilomewetodevoxuwureji.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4161e0877---83462542713.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611dca1f9c111---31584462548.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=different+ways+to+say+good+morning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e20a.bin
79b5d6ce5866000387f200dcd7fd7fc5522715cbda16ba4d853125a44205e214
pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 16616 bytes
font_01_sfnt_off00010d4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4E 16792 bytes
font_02_sfnt_off00012565.bin
22de2c1596663fcc9d606a811fdbf83bcfa44695cd443bdbdfe64a90f35b79f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12565 10852 bytes