Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb63c386e9f1a1ba…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 11:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b4b465452e4b7ce422adb62aa0b4832d SHA-1: 31fade9c28515829acd1af76950ce1db08c2ca73 SHA-256: cb63c386e9f1a1ba37fb302beac49f33c3f43981bf3ca2a1bc5dd755f4a9c86f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/2ba529a33bc10bcb95c8257471c79525/vaxebugotilegag.pdf In PDF document text
    • http://studiocariola.com/userfiles/files/vamixifudumevidenobebet.pdfIn PDF document text
    • http://identik.hu/editor_up/vuwexewo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f92174cfa---26303214271.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160861e99f35ad---mugeme.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/9fabo8nb67g1r34theakjbj6pd/20591462667.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/290254159951.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160791312b6c14---40665411281.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/kawuvuse.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/62604137582.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/85894898705.pdfIn PDF document text
    • http://wfca-czech.cz/temp/userfiles/files/25656798127.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160746d7d01934---64478482332.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adb99c17784---rujemasod.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/gazurirumur.pdfIn PDF document text
    • http://co-mit.com/uploads/files/mosizepotuzaduxodibod.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/92742485540.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f481d77695---28747794811.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb287e38ea---4565282169.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e7828a9c---49675576376.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac06a9cde---gulidafedotovebenizojog.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/71221742825.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/4124975172.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-5/20210505100219248208.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210512023615_1544617454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=nikon+d3500+manual+isoPDF 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_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 10676 bytes
SHA-256: bf782f6321251617e1e37e5fed4013f348e80b5285cb58167e17acd535926d51
font_01_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 16720 bytes
SHA-256: ea3a4db223a00b57e3d68e1f7b42ff90d0917aa443763fe6cd3abd59c6135b69
font_02_sfnt_off00011dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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