Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8af62957f3f44e…

MALICIOUS

PDF

115.9 KB Created: 2021-07-17 15:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 16bcfb244c4e151a88a94173b89c87ea SHA-1: d959dbc436241b3256a99dc7094de85e4d91a698 SHA-256: dc8af62957f3f44e7100d3283ae77f00f13f51b735c24ad73d6d573b2395db8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, likely serving as a link farm for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan delivery mechanism. While no scripts were directly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 6

  • 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.
  • 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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d792e912525---34640288283.pdf In PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/zogatinavipug.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/98741236144.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/re50plakgb8943ibik7v0ssuo5/3056959876.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/83782069491.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/jiziz.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18f992fa7---13800408205.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/e1vub9t500eretm8b38qkqsv7r/8304911169.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/kuvezupukurazofo.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/75144472198.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f83f5cecc8---3551053161.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/43531605082.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8b38c30879b99bc994f59e342c4e261b/masegafanil.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160987f43373fc---jinudefaluminaxisiv.pdfIn PDF document text
    • https://hoavily.com/uploads/files/sulexelewezozexobadug.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/nipikogigajibo.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/80856186260.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9c1bad10---nofodanetuponebor.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d7f7d04c2---63446279583.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/puvowu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608026808cff5---wirezapikebeguterokimuvax.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/jojugezowawamubizexapuw.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/vagoruzuxugivawopepubi.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ae32c821d4d---67058044380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=teamwork+from+homePDF link annotation
    • https://mediaget.com/userfiles/files/marena.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C48 10112 bytes
SHA-256: b02190920dd0fc81c0a3725dd4ad6e1a5eb5eeeb5e7783870c02548fb771e990
font_01_sfnt_off000162e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162E1 17992 bytes
SHA-256: 50c9cd64b21078b0da7929043592cfb48e0cd20d925f22ce0122f3210f3afc5e
font_02_sfnt_off000191df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191DF 17100 bytes
SHA-256: b3bb9bbc0514eff222464ab325dfc9fcb8abec2709d4c97147c20b6d9b600576
font_03_sfnt_off0001aa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1