Malicious PDF — malware analysis report

Static analysis result for SHA-256 3079628ea5c96609…

MALICIOUS

PDF

83.6 KB Created: 2021-07-14 07:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1ec1fb68e09bef0a4553e4800bcaabfa SHA-1: bdd7ea94a809ef88069635c4e390cf530c770e48 SHA-256: 3079628ea5c96609d960bf2b347be1f3a2d8ad5d80820fc1df5b29abcf0d599e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb717c95bb---buforawakaj.pdf In PDF document text
    • https://alice-immo.com/userfiles/file/86427136015.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/munesukinorusekubidozimig.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/89801525299.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608675c142d3e---zebewosoxibofuwikevisin.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c038d2446f2---48079574939.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd78687cd7---81666031616.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/952132484c8eea3156b48836e5088b81/84312820808.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/38208461622.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/kig9aj3nbk4scrg2bn9fmggos4/31764293145.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/82be9a7834a96dac56e1c55c1e4d4cf3/geresewobe.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/cce191132c527778ec4fbf4f13bffb16/52283210216.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/24346652892.pdfIn PDF document text
    • https://argumentua.com/i/file/99511680192.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/govosuzumofesibopapuxin.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074db3e79dd0---46627478924.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/mosorafojikagemona.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/sisewapuxavigoxa.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1797a74c6a512d2b30b09cdbe188530d/9629044408.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/52b9edc38cb6690c1decbf4087198cbf/37558784937.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c2cb6b1ca---jojobatev.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d509b0dc4f---jopuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=lcm+of+4+and+18PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4F 16836 bytes
SHA-256: df77139f85a9b2db1eb4699fd4570b182156c9327819a1656c0b0320bfd08dc5
font_01_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_03_sfnt_off00012823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12823 10296 bytes
SHA-256: a194db8732cad6448a233dab3b0f8a6e032fd122b37aa94d170c2e214427af2d

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