Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a86663f27eb2759…

MALICIOUS

PDF

84.6 KB Created: 2021-08-15 07:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 901df72e5c44db673737d0b10c72c5d1 SHA-1: 41722e23588aa2b69210da22f2a5a2b1c4a1a587 SHA-256: 9a86663f27eb27594da70e53416380da1aa975a0aff763dc01b5d0da5d7e9463
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to direct users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://aqbnb.com/uploadfile/file/72381621166.pdf In PDF document text
    • http://consulcongress.it/uploads/assets/file/gigixazokorubaxu.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/21320489869.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/36921026423.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6ad74f63---wofoja.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9eec9e838---51465127612.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ea39c89d3---24401050890.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/gapawewubog.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/8229769014.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/6153197362.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/e71c591438a97bdaf3dcd31770b6ba44/xunavokodogakixezowumade.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc535f3f5d2---88129100681.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/77237423827.pdfIn PDF document text
    • http://davisnewfoundlandfamilyreunion.com/clients/60627/File/xevirumumuvibuna.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/17878111773.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a73a29404---98211877525.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7ff296b0b---belutulowoxunetizan.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc102d74d5---zadosapofepisenifiloziz.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/ea21b43512a77901b08e21357b612d0e/vibonepuwuvofitim.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/qlfqun21djj907obt25t84148q/vuramobulaze.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/61201524440.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/jisufixuxebavuwizesegobo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc847f4d5---wuzideginalis.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6e1c69e09476f43305e98ff47843f975/gubopapezilad.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaa50e8c7a---wenuwawu.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/ba36e464d64dda95e5b1526342a9f296/mogoridasolisorupin.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/budujewadobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=6th+grade+language+arts+textbook+pdfPDF 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_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 16792 bytes
SHA-256: 92631b6e4de366ece4449cb8b34e8246c71e56cf1e8a18a3b9000aedcf8099f9
font_01_sfnt_off000110fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FC 11192 bytes
SHA-256: 5a6197e807385fee5ef26743f698332945bd404bac3c99579d4fbe3e8f8added
font_02_sfnt_off00012ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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