Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de1c7da28fda790…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 13:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4b62fbe24812d3df281cf47379c88d4b SHA-1: 1cb11c91b2ec1d5200e4a66b9b614c2ef03f2db5 SHA-256: 3de1c7da28fda79084a27adad716c7b3f156ee01f61c8e5571eae7c4d2f4149f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to potentially compromised websites. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=trova+cellulare+android', are likely used to redirect users to phishing or malware-hosting sites. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://archism.ru/uplcv?utm_term=trova+cellulare+android PDF link annotation
    • https://art-gallery.mn/uploads/files/rumejirazo.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/janopineburuliraxege.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631551751.pdfIn PDF document text
    • https://henuopack.com/d/files/49608805003.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/sudoragezitikelebiluxum.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bfc279f68---95057359900.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109200732168987.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6d07ca31ff6898221fbcee07d2087b4e/benenuponenewapu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134293d70ddf---zunoja.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16138598b27803---madawavukesimarakapube.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/vuwomuwu.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/watodorivavonivebomimawe.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b011df660---85938573025.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/didetolibeku.pdfIn PDF document text
    • http://dolonchem.com/upload/files/13964633175.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pizimigukizisozule.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/jofujateminat.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/96009227868.pdfIn PDF document text
    • https://2winit.com/Files/files/47199767700.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143535887bf9---molagebola.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/votuwibagigunad.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/mojanig.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/kotedagadekixedebawu.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/11607857175.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/845e3166be5219bef612fcda4adf105d/43903885708.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/43126893129.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_off0000da8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 10228 bytes
SHA-256: 6c8307af87556e56b7e74ee86b559bcd05d58ceec95b282c53cc263b30e5b70f
font_02_sfnt_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 16772 bytes
SHA-256: 9dc4c68fc935cad3892bc2159306bd0c20d0a1b4243ac759bf294cdaab92e213

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