Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ad86dc882576c9…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 22:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 06c253099a4f1664a6bac0209ff0972f SHA-1: ef02a430188ba5dc9900c17a98a4338440c8763d SHA-256: 27ad86dc882576c9f4e035360c18080140d001292430c5ccde5404a6160438c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs are present, some pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. Although no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/od91ijkeocvrh222d4tb7lmjli/rirelerar.pdf In PDF document text
    • http://alconburyreunion.com/clients/36523/File/41069488203.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/pofesufaritumu.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ehkl8tl83p6osb6nfgdl93lm10/tojoderozeroboxemu.pdfIn PDF document text
    • http://fitviewer.biz/files/file/5004469719.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/71427100552.pdfIn PDF document text
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/13418493095.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb5c3f08e---keluvebumoj.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/8297754007.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/gezubasiwidowonono.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/26611d2cdd25eceae5f472f67ce5dbb3/18280084931.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/216708004533bb38aad025c0e35a0dc3/93808960540.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/728fb572d1aa2e61dc7c1a4f5531c400/24346117618.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/90hpat8pk47aqg4ucdq7uq6h23/sawazujalosefelozifiwir.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/pefasoxepafopijewenu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad3af0e27b---durusetap.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f9c1fd35ecf2e2dc1d29c6f81c640776/66650468826.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc34c815eb---wotaginaxufekipupowinewot.pdfIn PDF document text
    • http://k1a.ru/images/files/file/lorerulerafafireniva.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/86414644621.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/tofoninebanatalaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=davis+instruments+vantage+pro2+iss+manualPDF link annotation
    • 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_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 10884 bytes
SHA-256: d22567c47e44227f9bb8a0537c4fc6131a8caf1c4512033a4b31ef623e8c8371
font_02_sfnt_off000111ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 18228 bytes
SHA-256: b068423d9cc1bfff84eade4844da52262e8f58d96f17c8768fd41aecd5b2354d

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