Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c827a354edb6104…

MALICIOUS

PDF

78.7 KB Created: 2021-06-30 19:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70f346d6928688fd8de5865da22a5221 SHA-1: ce6b53b35632783b7a52e8e6e15a7b9aab2320ba SHA-256: 7c827a354edb61043abda82968e0c9cded7a1ec3160e6c9e083d79da78cc482c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to compromised WordPress sites, suggesting it is part of a phishing or malware distribution campaign. The presence of these links, combined with the PDF structure, indicates an attempt to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b9bd609ac665cce7e3241beff31b43b9/4615316637.pdf
    • https://ksboutlet.com/file/files/satad.pdf
    • https://ancoraeducacion.com/images/naxixuxadawa.pdf
    • https://zzarosiscarampola.it/file/liripinorojiribelopomekix.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/9def0ac6b416f5c5a835c7b8d37a328d/44607335812.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/66075826762.pdf
    • http://kirakuramenandsushi.com/uploads/files/goxujudikelarazufepute.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b6ddeaee5564c6c0c95956b528b1285/74120668361.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d190dc5cb3c---bepenoxorivaluraluside.pdf
    • http://askort.pl/Upload/file/kovobazigijuvurifonirub.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e25bd801e1---54567470916.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5a7aeebaa---vobalisukuvuri.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/3566abf003054612950a9bf7b8deb44e/fixupakituwobego.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/88315557322.pdf
    • https://hsse.cl/files/20174409599.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2hkfehanj1sj1mmob2t97jlh6a/napapasezika.pdf
    • http://www.blueoak.fr/image/file/36502589810.pdf
    • https://anmoul.com/userfiles/file/27368390930.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2ef64ba23---mizudugegirofigebare.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/fe3d5ea111ccd0abaf140ad781d4af02/wilojixojotigebewa.pdf
    • https://telewebmarketing.com/FCKeditor/file/38472303897.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/77r1sshllndd36rl4g5efpb7pe/duvoxesuwo.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097693f809ea---11381356019.pdf
    • http://artside.org/data/temp/file/xodiziwusukibukowuzida.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160983ff0553bc---fipaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hulls+cove+visitor+center
    • 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_off0000d131.bin
f365da341736c136b18dcfb882f9db0b109e48533fa90f490542873767d4ce2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD131 17332 bytes
font_01_sfnt_off0000fe8d.bin
d270bb7a8cfc8ab160ab59b14eb521b11ce54e144e0e3adcc7df6632c3986a01
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 10220 bytes
font_02_sfnt_off00011599.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 16792 bytes