Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f3a7911f97a497…

MALICIOUS

PDF

101.6 KB Created: 2021-07-07 11:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9ab2c5d7b0e027b0b0b1e21941efa9c8 SHA-1: 7489a335ea7e93388beadf0e1686aa7d2d66016a SHA-256: c9f3a7911f97a497c65b3392a0277f994df66149dc7d7c3c2cf4cdecfdac7d77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links. Many of these links point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cructi.ru/uplcv?utm_term=inverse+property+of+proportion PDF link annotation
    • http://anhuifan.com/upload_fck/file/2021-5-14/20210514105101411620.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092edbc1b23b---givurusekibojaki.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/f351825527bb895a36f2e748c0fed4e8/13238576157.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa23c7c2a08---2524349824.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/76b9eef6eb3e9feeb65e3f456369c406/84078592328.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/92523003524.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/mljfc4j2bkkab4qa6nh4to399j/mebeberodepuro.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/49583908536.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/sevuvewarowanejufaga.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32d89e592---44086243789.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/16034362626.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-20/20210620045929615042.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/1cc0998f48d0d808b80e273d040396cc/tijobezuwixaloxakosefuwuz.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/nufimavegakam.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/bc5c9619085d4dcc78a2801def002363/47132710341.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a2f7fa4b42a1d3b803105184ee0abc12/rulabifiw.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857d0c63773---xoxerunugezaxa.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/75f1ac8d6fa19ecb83d2d8c5cbd1ff78/visozuzupubetezateradug.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/38986997686.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/78924897949.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608179da3a840---marelotokabemepus.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/hor2te18c7pgl7o145hhhhlmaj/vipalujajijojezovopubexa.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/vajirewilozobigo.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/vufoxizededewepenolopovek.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3e64d8e3c---25628464631.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde3a2caa9---xigapikapu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd11450876---26269932923.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210628002717168117pd0e1r.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14058 18452 bytes
SHA-256: 48e0a7551951b3957a3f00c580533e0d9d340737ce07fa31ba4c1b2613ff1460
font_02_sfnt_off0001715c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1715C 10276 bytes
SHA-256: 4b0c5d3c5521e7447279811bc045dbdeeff7f4bb151c3e4f6b67cb837190b24a

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