Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1c23da75606a98…

MALICIOUS

PDF

74.4 KB Created: 2021-09-01 10:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 928ad70245be578cfe585bd0af345a23 SHA-1: f3f04ed9052ea5be5b199491105382b64d9f8db9 SHA-256: fb1c23da75606a98e5846bf33089eb0893ce604965ddfbc99ed40f0de3713ea3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161133b8b387b0---lovuzeji.pdf In PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd25bd9ef---nevofu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160aa34a2b94e2---nopudetodolu.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/42899014522.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/40514973460.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/xizivilovigoresegixa.pdfIn PDF document text
    • http://brenderup.ro/mm/file/21962740472.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/2783978c07fc090e86fca6461a5112ec/82554206646.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/dujizakosa.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/81388712674.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/busudulavefon.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210613_5E6354F8DA544010.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/25139357875.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/83772732110.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/vizosidusimiwidopinozopiw.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/21747609093.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/22962074400.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607257b479e98---3210480001.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a52a63839182fa0d39df475f1ea5d56b/27288476479.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/14694392472.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/wunewujatale.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b579d16d5d4---68088770378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+outpost+lodge+krugerPDF 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_off0000c168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC168 16268 bytes
SHA-256: 79492c01d1e528a26a25483faeac2c7af6d73b31fea42df8a7351129aa5baa65
font_01_sfnt_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 10468 bytes
SHA-256: 165c3ab49dda77e384058b6b779888b499f4afed7ca6a5274bc642aff2b7c5dd
font_02_sfnt_off00010325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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