Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce5af13c352b15b…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 04:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3244f3135e61d3b5a77ade0c65b1c688 SHA-1: d824cac0d0306b063b80f94eebe52a6591178139 SHA-256: cce5af13c352b15ba37311cb2eb7f45f6dec096c50cfb3c4c9c7de3e85786077
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites that appear to be compromised or are hosting PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to distribute content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607060ad73c41---16039879267.pdf In PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/semuz.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/zewizuburaxaju.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d244fd3f---93667309465.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/69418771993.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e0efea615f7658e2529ad088eb1c5898/9780003111.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/59472335496.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/0a99ea99fabf441c209407a439fd2412/85415783392.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/tivajej.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/rituvuwaxime.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/piranidexugerajiwite.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/ravubumipakezobajadejedat.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/milogazigib.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/39e0ff5075ce12123f4b37844a0ec446/19226725259.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/36888935432.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/0dm2etci337ama40ebbbdufaeu/24466493841.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769f79d7fe5---8461850071.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4f871f76cce58ee35c4b97ccb64ddce7/pafaxizigijorutigoridago.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/worukatumavima.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/tatulegevoviragesu.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4783e40375ef20ea62ac964851617f82/tesesaboj.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/savulelutozesogojus.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/10886746593.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210828050959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=project+charter+definition+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_01_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 10636 bytes
SHA-256: e5d153f781877835c5c9d5ae976055817eba27fa19060707437e7b3153e3e872
font_02_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3D 16316 bytes
SHA-256: 61e366e76841d0c7826ffe63477d5de3a932aeef8c397a10b95742402e732a28

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