Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b94ab9ab5bb179…

MALICIOUS

PDF

111.1 KB Created: 2021-06-25 17:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd73df301f27df4fbe8207fb14f401a2 SHA-1: 2a301769c8e7dc4ef002cb6df4c50b2ac63260b8 SHA-256: 57b94ab9ab5bb179450aff124d0e9df3e34648c64d96c88ffc8083082d88dd96
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to host malicious or phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves tricking users into clicking links within the document, leading them to potentially harmful external resources.

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc927220eab---46546888322.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/dc6b046967028d2df2d7e18160f1c70a/1595718887.pdf
    • http://sva-jeanroze.com/xmedia/file/nonekexituloxi.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/62b7d72d978a44d25b4f1275d237a282/42951482000.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/5611d7c8c4f19a8b8e2f9cab895a5827/16197622591.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/873hvlvf95to1geihegcs4t552/wigoromamomofusemaxodezi.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/dobijujil.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/8fea6b7e9ac4f13ca0a8766381b84ce5/remijubixesujinit.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c59860440977cc75e33d35e96047e6a6/88023369476.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/2s1cgqb3ur9k6g4fp521buv6ft/koxosejitovalu.pdf
    • http://ya-ke.cn/admin/upload/66848290679.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wevurikuzijowawilizutano.pdf
    • http://arniestribu.com/campannas/file/19192540524.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c22a6b865---90571239744.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad33c13d8fa---65487647367.pdf
    • http://fedoro.ru/upload/file/21230385736.pdf
    • http://vickerycarpet.com/uploads/images//files/sewoxewatajifoke.pdf
    • https://tectrongim.com/uploads/files/16202715551.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ea11ff0786770d02dc68f51bb14fc7b9/19463332046.pdf
    • http://101-games.ru/images/uploads/files/bamitusixokuxinuwilesafa.pdf
    • http://jaatkinson.com/userimages/59014956036.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/vinadixukakixuvozipikimo.pdf
    • https://ruiguoex.com/upfile/files/2021/06/08/xumasuleguviti.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0f1247f8637adbd6c55689983f1f4363/wasiwikixagafejubuf.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/d2pkqp40f0dnpn09k4nflia6op/jujofarilorofolatilopa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+waterfalls+in+nc+mountains
    • 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_off00014fce.bin
79073efc4fe9fa5cc37afb3d81f96cca04fdc4fd3592fb514f1a152123e3644c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCE 17768 bytes
font_01_sfnt_off00017e15.bin
23a3c5697f4d02d8dfec6f267daef1ba2d6f5be49acb6e8ec55b785d99710de6
pdf-font-stream PDF embedded font (sfnt) at offset 0x17E15 10736 bytes
font_02_sfnt_off000196da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x196DA 16792 bytes