Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde6321b96d7fab2…

MALICIOUS

PDF

76.9 KB Created: 2021-06-28 22:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 391950e64f03ef2a04281a382f52e91e SHA-1: bd369280ee89b47dc4ed70f5cda3f4ee06b1bbc0 SHA-256: fde6321b96d7fab258b8afdb90cfc6a0e32e389c5aa1268c4ae6fa9a3ff1dede
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://smidgel.ru/uplcv?utm_term=the+world+record+paper+airplane+pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf81f88fcfb---wawesudujasisujabubesu.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/q8q2c27krhv5i2mpkhftmajh9e/37951630903.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a696088965c---39466008029.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/bidisivanupapafusaju.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c8faa337b---woxaxinojekefajakugejun.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/1ndsbvl4ci22as7isvv5kp39sn/rofatapetevidoj.pdf
    • http://immobilieninvestors.de/userfiles/file/77373748839.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fd68dqshj890dhvq4qpbm5gui3/dafazuzevuzunobej.pdf
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/35208308021.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16087180e6d832---bejigi.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd44fbd5fc---30290032115.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6d766e524bd71a3a525c88df6856417a/dobubiso.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1609d03f15be4f---41897531879.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f483d67798---fafewezupuvumesaviwis.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16098c344dd9a0---lukaziziripimenimokilarat.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/baf118aa3003e68bbd632cbe90f59b9d/kuretan.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/96899758559.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5218c5fde---zesomasusulifo.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0cf99277788939b34022adc3b665526c/soluxepupebed.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c3a9c4b12d21a9b6150d981935e31785/tosikexurapumawogapofi.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/57853493163.pdf
    • http://fitviewer.de/files/file/36751810824.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/4715e7605b7df80e14c2ccf6c7fa1d70/povobaw.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/f97a808d682aea51806b90bf8eb33a92/fibog.pdf
    • 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_off0000cbfb.bin
e3fbbea84f3d80fbb01b83fbb9cd9de7c47055d62a670817f9a8236f33e32062
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFB 16580 bytes
font_01_sfnt_off0000f6d2.bin
58448af1c5e58136443a147b98cd05e4d6c5bfa1d7891f557a1380d7052789d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 10500 bytes
font_02_sfnt_off00010ea5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA5 16792 bytes