Malicious PDF — malware analysis report

Static analysis result for SHA-256 c127bb8710c2a6a2…

MALICIOUS

PDF

87.1 KB Created: 2021-06-27 11:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e9992f1505452802317ddc92689517db SHA-1: 10418c4df32b1d6c4f691d03c7d6490246396f8b SHA-256: c127bb8710c2a6a21495af2ea1e21ab122cef5d36da96c26b3e539df53d5fae5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and other disposable hosting domains, likely to facilitate the download of a secondary payload. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=church+income+and+expense+statement+template+excel PDF link annotation
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607da6fca6c10---74997604377.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085928b04929---21161190909.pdfIn PDF document text
    • http://446888.top/userfiles/file/37276335957.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/sunoxor.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/66188437584.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/60422984998.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7df577eeef---wirigoxajasiwof.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/17220195049.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/99913865229.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/faxanetozapifuk.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4m8hh2iridl58frdt7v3s4ton5/gerojufategabasan.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/dfft28gtfh4a5h0dr5s5bspg31/38077907443.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/zarutagul.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///24299403002.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085a1c62fa94---jafexuxemakabejibeninil.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/78342699299.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9048c62f---ruperevavelozufa.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607071ce9824e---womedowibenuveroji.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vexanozeweforoniniriwe.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/rsgt7sn1tul7j5m076dtsl9oq3/riwabumuputefigo.pdfIn PDF document text
    • http://cl-pub.com/files/files/gakavuregosonufebedakidi.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/28992945989.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/notexef.pdfIn PDF document text
    • http://ubest.ru/images/file/59665584751.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba3c24950---zabifonuxakegilimowosumul.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807a498208f---kilexigunapusisiwe.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_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 17180 bytes
SHA-256: 8e7b7263ea164707a2a2637a11ba64ad39f68dac4120c00be311ce24a8318a9c
font_02_sfnt_off00013552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13552 11012 bytes
SHA-256: f5c4fd1b9c49ee15c4157f5f7d13f7899284bf2f029242b258cb70dfd57782d1

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