Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd8f8c08ca6f5c7…

MALICIOUS

PDF

84.9 KB Created: 2021-07-03 12:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c54e1e272cfeb555068379ddd7d0caa2 SHA-1: 66dbb5599273bc98bd7949eb5ee65bf2668f1ba6 SHA-256: 7dd8f8c08ca6f5c7bd063b40ab60dae4f42a14e1cda9125aab3bad0832b9f8b9
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The presence of numerous distinct hosts and links indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2df09e0f1---93955688827.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13d82cf034---69804643935.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/0lssj4l3vlvloi6k8ra2f2flrh/fukumufulanulefawapo.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4404e65d6---49125229612.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/59022696429.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/44701123829.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/36c5f366fc31f9c008e58eb4a65aa028/9310094591.pdf
    • http://hpworld.hu/data/pic/Image/file/zobijid.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4a1aee875---9311197701.pdf
    • http://ciaooo.ru/uploades/userfiles/file/3187358064.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/cia6jgvmnq32de4p8j4ele68n0/65686150968.pdf
    • http://alarcon-v.com/editor_upload_image/file/togeraxozojufosabikamol.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/28232f26ee9a2b217ab939c01666b7c6/82415476858.pdf
    • http://premiercontractinginc.com/files/file/jefumapibiburatavux.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4b247d29d---32361099929.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095b2e92adcf---9773171663.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d31d72cbda2979a1f58e5e9482ba6a0f/9595424552.pdf
    • http://ms-krmelin.cz/app/webroot/files/files/18392109027.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160705c492da72---14859034797.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a6da5f9b---28691544112.pdf
    • http://xn--aknmedcal-wpbe.com/uploads/file/87190392203.pdf
    • http://akicgiyim.com/userfiles/file/wikofux.pdf
    • https://yar-net.ru/userfiles/file/87132570903.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=survey+questionnaire+about+consumer+buying+behavior
    • 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_off0000e652.bin
4c8b997b11ef34b3c93fa75cd467506a14e0ad88e82e39841224fbbcd749b92c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 11272 bytes
font_01_sfnt_off00010058.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 16792 bytes
font_02_sfnt_off0001186a.bin
3444dfde3b690159cdfb4da4973f12be97763bb878d35d1981cfd789c1d4cd13
pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 17612 bytes