Malicious PDF — malware analysis report

Static analysis result for SHA-256 0354432374f9d4b6…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 08:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1bf260b2d3cf298d7592359158e2b1a9 SHA-1: d3e9fbec60acebf3b2e1232ca699f45fdef11d21 SHA-256: 0354432374f9d4b6704ff8551b33108bff8d62a384498b3ed8cdb309033f54cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://krisoc.ru/uplcv?utm_term=uefi+ubuntu+dual+boot PDF link annotation
    • https://inprovitperu.com/ckfinder/userfiles/files/65458119178.pdfIn PDF document text
    • http://climtech.com/files/files/76136191282.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/73803079472.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/22734865883.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210902232842.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/pc3u9ud4hov0n2fsoujqne3tk9/23810777926.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/rikizujopu.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/v8lb2tic4bonshm803fbctcbf5/65863700570.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/repox.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/53516636979.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/fekiripesekebivokeganat.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/milajipodefevumupoditil.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210908_0F5A397EB4BA6E47.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/tatuvolaginugefi.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/65038152422.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/5319964899.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/putowafikisusivojavil.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109041413549065.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adfa36308f---vudelajexizokezelonuxus.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613561a3ee95e---vadepipog.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/wurunilokexugifozukojod.pdfIn PDF document text
    • http://www.moyekolodin.com/files/naxibixurufavoj.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437c9e3e91f---86024902394.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/43112349875.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/27o9reln77qbdojnhh3qktv3d7/denixugu.pdfIn PDF document text
    • http://sql110.com/pic/kasafirapevojedebibu.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_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 18444 bytes
SHA-256: 8079f3f86cf4dd1a978cbd9a04fe3c51e15a00273d4d455870c2ebcd6c20700a
font_01_sfnt_off000117dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DD 10328 bytes
SHA-256: 944a9e5adbf6a30507d231a4707eff469c4f3b87f695ddf169ad36c407bfc166
font_02_sfnt_off00012f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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