Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cb0698c5d6b3f5…

MALICIOUS

PDF

75.2 KB Created: 2021-08-26 14:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d6d84d6529ac32ce4de7f615042180cd SHA-1: 4d684fc54eea5cf0a3f650b72f2558699b2150ed SHA-256: 15cb0698c5d6b3f51c30e5c24e070da5aba3be5d95b56d1b1aa2e80bc748ca51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://heibldr.hu/FCKfeltoltott/file/19337342479.pdf In PDF document text
    • http://fratellilongoni.com/userfiles/files/92868697417.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f31be5fd0---66775618658.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de5dac3c95---wiguruzi.pdfIn PDF document text
    • http://short-story.ru/upload/file/dumikewawoted.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1430d3de2e---40285465882.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0a44442e7---nugegob.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/67731688700.pdfIn PDF document text
    • http://casaalu.com/luutru/files/vezegu.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/zuzekuregeb.pdfIn PDF document text
    • http://artospace.com/pics/file/45385636318.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/zotojurisimixutapepez.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/fenajemepakumu.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/87101496869.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d432aa6e6b---10697109305.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/3797046503.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3c3b21449---vadepozuzixigogevijudago.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/6d3b00033bab31ff8536b12c2c6fefb4/nekapalabopegevatepo.pdfIn PDF document text
    • https://xistenze.com/files/files/lavubo.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/mopid.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/wuwupatetolesosipe.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/s6dhm4uucn0ll19v17gb234prc/fasal.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/26251635142.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/zugunojovabilivujuzugote.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/55daa886bca2f21b286e3b8b83d51152/20593960469.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/95073584360bbe04384ecb.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/586ec37d9c0ab722441c47d01e0f4afd/39329446508.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ef1413d8f---2738066137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=calculate+the+median+from+the+following+dataPDF 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_off0000c31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31D 10972 bytes
SHA-256: 38cc3ba84a18c0478f93fc644fa31760e70e87ec0a0f6dc523ee562cd937fa26
font_01_sfnt_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 16260 bytes
SHA-256: 9b110730143e6cddbcc6e28a233e8acc9783607bfa8c59e05c737b3a97262d32
font_02_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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