Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd20e8801a6d255…

MALICIOUS

PDF

86.4 KB Created: 2021-07-24 20:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee7bc52bce5a3f6c0bd539dcbf63defc SHA-1: 82ef566ac99e43c10e8ddf4825b28d6663b70831 SHA-256: 7cd20e8801a6d2557b7700a36853e5825de95dae23ea785f75f1939bcc4da0c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The presence of embedded JavaScript, flagged by heuristics, further indicates potential for malicious activity such as downloading secondary payloads or executing exploits. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b122987db1---wubusivugolenigafaxoru.pdf
    • http://txextremecarts.com/userfiles/file/dedogemoseg.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb07fd72a7---mufofexibataxevi.pdf
    • https://ukmalayalamnews.com/userfiles/file/wuxokoxuvipekusufogasa.pdf
    • http://anbao.vn/uploads/userfiles/file/58076757134.pdf
    • http://hkbroadwin.com/userfiles/76207194307.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/sajifagodi.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/03f087049cc30388f78c804f9f9c84cb/28151545485.pdf
    • http://tz5168.com/uploadfile/image/2021/05/28/file/20210528_072813_109.pdf
    • http://boathousebrokerage.com/userfiles/file/xigijaruxadukepufavu.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b7a2c7794---33877302455.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/a1b7cf25cafa8497379de0dd1ece6aad/warupomulotovede.pdf
    • http://grandrosso.com/js/upload/files/38592044799.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a560726f552---50859985149.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be30ee2b010---nefodijomiramezi.pdf
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/sudarejasafozumozutemepid.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/geporupobojiwumid.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/0f73a96086a64c43f8f599c1525c288c/jonil.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/putaxegopojitofewix.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16077fa1359871---30419315378.pdf
    • http://lakesnwoodskerala.com/uploads/file/41786113139.pdf
    • https://cristalensi.com/public/File/205875022.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/f2325e38787005a638d727a5ddada93f/fodesapove.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+hisense+android+tv
    • 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_off0000f099.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 16792 bytes
font_01_sfnt_off000108b0.bin
5f2734b80546cea470d1d640e1acd459e1b3a56202b5fcace90734723fc30706
pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 10360 bytes
font_02_sfnt_off00012013.bin
e26b81b16c022d634243ba38728839762403d4c75e05f63ec3b8f9d9bacde7e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12013 16948 bytes