Malicious PDF — malware analysis report

Static analysis result for SHA-256 7333b5390ba16b76…

MALICIOUS

PDF

100.9 KB Created: 2021-06-29 03:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5489dd9f24460ea87c8c0c9733e9d46 SHA-1: 321df402b0cb19137f65100cfd2731e6ca4feb34 SHA-256: 7333b5390ba16b76077dd012423c9847d994167ae43167606d8a15b717e03ef0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing formcraft or super-forms plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these compromised hosts. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe188c94f2---73563068948.pdf
    • http://jarosi.hu/files/file/tezivawura.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4501a259467175c4fa449193823fb4c4/kovolizovilomedupogagimeg.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/11695745848.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/6b34d3dc606e754c076a1d0a6c7f02d6/84655453888.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32bc703271---nobufagifote.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609142bd848b0---88155880248.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb14ae3e8---xorusuvo.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ab72de47dffb62dfbb30454926f51879/62839227053.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afefb75a678---21660069139.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1838d2b4fd99068b0851dcc710636263/90427731787.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160834d98970cb---50549158825.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e96cf957536292e82af220bf8ee761a1/10551508313.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ba5e49fc4a75cf95139ba87c70514cfd/43449297462.pdf
    • http://simonkuehner.de/gfx/userfiles/files/72384913728.pdf
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/neluziwunemizenukenu.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/15e00a4ab068e0435e2ebad2ba0a7886/savusoralagabez.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mt4cmu5kbjvfj64t2qqnp5vge3/73031166017.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/69815734355.pdf
    • https://aartipalette.com/userfiles/file/19225874510.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/n77l0v4sj2t2p2med5mh0qalu3/lonalunupudeguzakazediv.pdf
    • http://aelma.com/sites/default/userfiles/file/83354579185.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8ca9b6688---mekixijulovu.pdf
    • http://akicgiyim.com/userfiles/file/6926663154.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+victory+is+ours+but+the+battle+is+the+lord%27s
    • 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_off000124f9.bin
d3433198d4963b5bd895d634120fdf5af00b00aa5c267e9aa837a7208bf1ab78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124F9 10780 bytes
font_01_sfnt_off00013e10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E10 16792 bytes
font_02_sfnt_off00015622.bin
2ebb50a4420d07f39aab43c0dc879bea5b885bc6ef0524d2e4db740f08e2bfaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15622 17584 bytes

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