Malicious PDF — malware analysis report

Static analysis result for SHA-256 79946acc472920fd…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 12:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ccc589cf04439c388afc27e47f6da1cb SHA-1: a47909f3deb32058ea03955748d64fa49fa28498 SHA-256: 79946acc472920fdbefa66fa47676c3e3cb8f5d0632323f11f08fc19050cda45
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to PDFs hosted on potentially compromised or disposable domains. The presence of multiple unknown PDF links suggests a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/g8pu6bjonlakf02k2nurhrkgl3/defopisomuvifitaxubidevud.pdf In PDF document text
    • http://zafirkort.com/uploads/files/86131819731.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b402d8c6d55---mudipojuraborotipinokapu.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/57036785440.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/58665865942.pdfIn PDF document text
    • http://zzweien.com/d/files/96443455546.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021072817013261.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/tuteti.pdfIn PDF document text
    • https://people11people.gr/uploads/File/lejokilu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/n2hkeuftbcjbnm7c4g8n9obpi2/vikame.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a352f5379c9aa84a92ae5488714fc5b4/givomajowalofitolus.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/navotikixal.pdfIn PDF document text
    • http://fabtur.ru/upload/files/31657667061.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/44910765424.pdfIn PDF document text
    • http://gerocuki.hu/user/file/3915541812.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/66052171868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=rules+of+third+gridPDF 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_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 10512 bytes
SHA-256: 1a01aeeafb4da59766433b35ec72864f8d1f2908bd4ad901ad2fccdd28c55c41
font_01_sfnt_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 18988 bytes
SHA-256: fcac815b90f831aad9621aed9437da96065b25857b73a9aa74a52acad10aa342
font_02_sfnt_off00011d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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