Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76d1f771e1eef31…

MALICIOUS

PDF

73.9 KB Created: 2021-06-27 06:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6ef8d2ff8be330f7273de9adf9d8cbb SHA-1: 420c3f9168bb14ea99db8edeb40c27ded4ff95fb SHA-256: f76d1f771e1eef31ab3da807ce7ecaa385e7109eee31c8a69cecfb6791a1a4e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions. It also features a link farm pointing to compromised WordPress upload storage and disposable hosting, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://yuha.be/_files/file/wixowojavalotifoboxerek.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160882d14774b3---21776097532.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2d247e8a37a3905bbf708b1a83c2807f/legedenilepesexet.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60205050df---bexurukij.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b25fa8ccdd---nubukodipuvuropubojuvenig.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9b20b45c301c00ce4ef19692f7746bd4/43132505258.pdf
    • https://alternativecarrepair.com/userfiles/file/9425916305.pdf
    • https://gyandeepjkss.org/userfiles/file/26854621397.pdf
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/12f198a9a20d032cb258a2aeda54d713/65985366098.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/32148abb1f00b88d22607f26466f33b1/worobupoxaledere.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/iu0fgh8ci89u1jh76st0k55vd9/tuxotovasesivunu.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c23e201aeb---98802283500.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/14496476606.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607453ea8e550---wuduninetafisatibor.pdf
    • http://dspec-car.com/js/upload/files/9986842893.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/014b480de8107baf27482f98dca15f69/49915955631.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/uht8d4qf0umer60b1c6eb8glu9/bukopofegirubejuredafinoj.pdf
    • http://agrobud.net/uploaded/file/penomizafefe.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/42507980938.pdf
    • https://genericdiabeticteststrips.com/userfiles/files/33189287630.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/40211280501.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210524080458.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/nekipudad.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=baby+a+triple
    • 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_off0000c172.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC172 16792 bytes
font_01_sfnt_off0000d989.bin
46455fbd93cc784ca4e28458bed97245dffd0c0e5288dbc7137a5d863c019389
pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 10160 bytes
font_02_sfnt_off0000f032.bin
3b6eec4d45ced6143bd790aebe643621fd6b81b5f609f4f1956967751658fa83
pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 16548 bytes