Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4c20f1e1525c80…

MALICIOUS

PDF

80.8 KB Created: 2021-07-18 06:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0eef136d24764c400dcfae702ff11c17 SHA-1: 4ecd8440f26265505e8c1798372a766df3cc6924 SHA-256: af4c20f1e1525c8046f89c37d8a7b2caf959cd965178977568cb049302b30712
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd7fe1f23---9779483769.pdf
    • http://thienlongadv.com/upload/files/lototadigi.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26402a5236---45936055906.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2e0e39b62---96824423902.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/738fe2c689fa753fa7c46c0e3127bce0/maluralafelaxazag.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a487131d0---kebomawozepepesuzufoma.pdf
    • https://amitadevnani.com/userfiles/file/12531672811.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747c1d3a1c0---xaxunemezikolukoxitimij.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/67d5170f5cefc2cc74c30528fdb21d4a/40359403679.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f8d5454e8d90dcc8b6b5b8c2e97c04bb/72193695235.pdf
    • http://massageindex.nl/images/uploads/3477682640.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608097b7e0897---62310421981.pdf
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/fikugulutazigafetigunox.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c235bacd556---34896817284.pdf
    • http://www.lugashotel.com/data/editorfile/vusata.pdf
    • https://cornerstonelaw.eu/userfiles//file/wibivoxasufezopavo.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5f485a9ea---jekudozube.pdf
    • https://alajuusa.ee/media/contents/file/joxasavatabozunekamapis.pdf
    • https://12tiga.com/contents//files/komokejefekiki.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e8975dc63---41489895346.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a42ff17f8---98205184069.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=freight+management+holdings+pty+ltd
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d92a.bin
e084a1c1cdab010e9bce25d47630757c9d75c72588107777765b2541b7f757a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 10932 bytes
font_01_sfnt_off0000f212.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 16792 bytes
font_02_sfnt_off00010a24.bin
6bbee413776148faf1fd777caf70adc48ec8faf7157ea0b82b5f98abed295a43
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A24 16860 bytes