Malicious PDF — malware analysis report

Static analysis result for SHA-256 15404f70ab283c16…

MALICIOUS

PDF

90.4 KB Created: 2021-09-15 09:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d6c4d4e4055e371ac169e249bcc7ef2 SHA-1: a059abb70dd7f70c6de754c320b10b8be1f3b92b SHA-256: 15404f70ab283c167d0530a932242aeafbd790c4206591800dc799aa9db17035
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, several of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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.deco-interieure.com/userfiles/file/garijuxudoraxarijirotusev.pdf In PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/fibofe.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/sasekibaxisofe.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/masegixav.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/81ef4ea25b7f3b4a9c6abdc105db750c/xonava.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161412b85f31af---44677929315.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/timoramaxoditejofapuk.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/mekazuredupotumid.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/pejanefaju.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc62460796---defebezebolatojod.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/52688626149.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/xagukafo.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/musisofitasa.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/rakipavuxakemaforizo.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/771b96d176026d0ba779c4d78ce5b3ce/luwefozivu.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/tenigu.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/nefedaf.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/55459481340.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/gepoj.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/10007242243.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/sofuvekudipeteliruwelop.pdfIn PDF document text
    • https://mlspoland.co/files/file/jojineso.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903022059.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021090614232073499.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/xivafufu.pdfIn PDF document text
    • http://vhshf.de/File/75599797304.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb7e4cecdf---79589203201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fifty+shades+darker+full+movie+streamingPDF 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_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 11148 bytes
SHA-256: 5b6329c0c1fd3da8c89bdc1fb85cb0830271079387e8fcd66f2288bb6c5fe38b
font_02_sfnt_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 18504 bytes
SHA-256: 4772324b5e4e5fea29b937f32f47da7c0f704612138be17d7a99d2bcf26f5ddf

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