Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e50b6970bfe9d8…

MALICIOUS

PDF

80.2 KB Created: 2021-06-28 02:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2a8281080eb6c41cf82e2d7e5e2d1f9 SHA-1: 067e7418bc24055bce64524b42c079d28b657345 SHA-256: 93e50b6970bfe9d8e9ce79bd683247e290498dd9057208ab92201259f705773b
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, some pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://hydrem.ru/images/file/36205208672.pdf
    • http://faradbox.pl/files/file/82848990863.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/37896111529.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7a432f851---malazovawijesudeg.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a966a6497---59568406601.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/7gg4lhvsbl6901sbdth3rnt434/60093470006.pdf
    • http://zkojicin.cz/userfiles/file/zifovofowabatuweje.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883df063067---zodokusijimilal.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e79d03d34---kujujetogotun.pdf
    • http://tahi.hu/ckfinder/userfiles/files/25698460907.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3e9712cf9---nedisiwolufufafimemarez.pdf
    • http://adabaskimerkezi.com/upload/file/fiweporukufo.pdf
    • http://jaatkinson.com/userimages/bugiduzawijotixirupurof.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a398930e767---wejubonujupulufusegisolew.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/pmb1rut57j3t6ioe0gbg3ofnau/xudekaxumat.pdf
    • http://ascensionchina.com/userfiles/file/zominebe.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a1e65974aec5d6ad03c7f7fed5943030/gobamasajivolusexa.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/aphbfh13u340qoimg47839cetr/sejudugegosetiguzez.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bad212d958a---22660051732.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af83b95bc61---17214386588.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/dfea44fa34e30a22062fe79f393b9fc4/topukobumusobed.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091dcf096570---mikeponire.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/g9ll06d1fq49uil5j78d295b9a/xabariruzifinoxaxumiwe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=rs+aggarwal+8th+class
    • 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_off0000d802.bin
c725efbdc856f5cf9eece413280ae71771b8a39b41abcc5678212a4986ce609a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 16800 bytes
font_01_sfnt_off000103a6.bin
ec600559a6e1aaa55a00eb32ff6e85bc80a56d8126d18eb8d41c31e8ce4c48c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 10400 bytes
font_02_sfnt_off00011b76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B76 16792 bytes

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