Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a8e41f2cbc750a…

MALICIOUS

PDF

97.9 KB Created: 2021-09-02 11:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a989b06d22e471ddaec05dee3b902a5a SHA-1: 4fd97aa28d1e1dd5ffb59a1723afaefd832bccae SHA-256: c1a8e41f2cbc750aef860f11116274d95fafbaa705675f745b39e729c101ffaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://wastran.ru/uplcv?utm_term=jesus+bleibet+meine+freude+chor+pdf PDF link annotation
    • https://augsburger-dartliga.de/uploads/file/9751766621.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/juvuvekidolonaromalubawaj.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/db7c348f98ff65f7387bd6254dd91f99/208778628.pdfIn PDF document text
    • http://hongdacable.com/d/files/10156806552.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/gikafeniruvomumunum.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/74299987645.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/cde8c191fb3e7ac1a108a6035e7ecf33/dasokutupelimamip.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/fikudupopomofuridepopak.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/cb263a3b174e8e0fa53a87a5899bfbc0/tatafuxekonegunaboxigaxa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11a612f6d4---rukitujojezo.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/sobulajolitufofigi.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/42297930949.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/81681019945.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/83051678966.pdfIn PDF document text
    • https://isleo.com/i_photos/file/4471849658.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/dabatis.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fv5vigsc3f89956ugvmmmakft7/foxegonedigozipep.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/3qk19rcjdmklan8m68rmkdme12/votebisoliral.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbfed537bb---vebuxekepoxuvufazisaf.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/surigifusurib.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/83390308973.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/xisavazokijefixozade.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/22458527433.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/wezuneturogojob.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_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 21456 bytes
SHA-256: 88fc7e3a5b4e69c7da68736139558ebdbae51e4c9d021341d108a81a26b0c265
font_01_sfnt_off00014701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14701 10952 bytes
SHA-256: 7353af56b0326564ee3e2f940da89986f5a41955705d6b3fa1515bbd6e657c02
font_02_sfnt_off00015ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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