Malicious PDF — malware analysis report

Static analysis result for SHA-256 146889262b28e4f4…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 15:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 78101c7bd253276268a828e0669ee790 SHA-1: 380b205ff9c1391cdfb22ba495594d43c74bae17 SHA-256: 146889262b28e4f43b79755ef2c3aacb8bce5ff8ec98cb157d10928e59f93ffa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4759

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://crysiq.ru/uplcv?utm_term=direct+speech+to+indirect+speech+exercises+with+answers+pdf PDF link annotation
    • http://plkorea77.com/ckupload/files/67324753713.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a46913b528e---43337063035.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/ragixetiworixetumojo.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021712042172889.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d11048e625a821c19af6a1b23af21a09/gufexisesuwexesusegizag.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/gabezesuwu.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/waladudomelubujidazas.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/xotebuxedilajavowulas.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/76219354320.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086d465ca9fc---31024483878.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c45fc9665---15666100349.pdfIn PDF document text
    • http://skolky.info/foto/images/file/66819770968.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161264c2d58206---27965378276.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085049ba3713---1260114748.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/74872006151.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jqr2e60lfghlpbi4bfoosq4jti/fimonobomavu.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/xanavuvutun.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/35008755253.pdfIn PDF document text
    • http://ligneus.hu/upload/file/68326721871.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/46263456256.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/rinijadi.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/tazofovazepikazesobemami.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34106b1554---gidinidesefijuzufinelef.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/1680308006.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///jagud.pdfIn 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_off0000c01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 10860 bytes
SHA-256: 668e776ffbee58a7b430c568c601ada695c26e90947cb4f0128f75ee851c0f30
font_02_sfnt_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 16092 bytes
SHA-256: ba335aa4759b67d298cc22af89dcda6e05617591509e7805bff1e0c0157dae00