Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51e71de01e13d91…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 21:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bf010990aec0e4836b6793a42a693e93 SHA-1: c78d89c100a76f36b2e703d89fc755f0afe55b92 SHA-256: f51e71de01e13d918ee7ac4c750406a15773562de48ba1a2891282254f24bf57
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8ff58bc77---ripoxutuxun.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457d2349c74---308777336.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210911_3E1BE5570E57B7F7.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73839552996.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/61880321938.pdfIn PDF document text
    • http://pololanna.com/user_img/files/14552485068.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/12152517460.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/37558622366.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16140f21288b3b---78131333702.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/86522859289.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/laxibusaxasafuxunije.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/zidufuwetusudiz.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/9757952871.pdfIn PDF document text
    • http://devveb.net/userfiles/file/xoxapetagipozikomipu.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61695176544.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/xelipexerawenogafazoril.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/37340932679.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/gimixexutogewome.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/28408250164.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/gataj.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/wewepomamino.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77054234414.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6198cee7c5c94843695f948fd63801f6/tezakokuwep.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/67817434946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=who+invented+jelly+beansPDF 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_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 16540 bytes
SHA-256: 8b41f355c9998e712d41a19a0f2e1183ebe7a0802a2c507af128be8c1bbf549f
font_01_sfnt_off000103ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 10688 bytes
SHA-256: 8dece955f2ed33828620f16c5a701233120571b0e0b35512622a81dc6b2043c8
font_02_sfnt_off00011c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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