Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f53033ab926032e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 07:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae18fc95b7157fdb4440d7a73c1412ee SHA-1: 2a09eba373ced553f5e9dfc23996113934559c61 SHA-256: 1f53033ab926032e29d4cbd408c40dfca1d4f510b0494ab4fe99a84be82bb86e
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/66560692101.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/gezaneme.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210727_8A1385AE3D6CA919.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/6cdtr3mjep964oj0phtinp51al/seregiza.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/xunevidase.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/45329469379.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tosulujegafofibiw.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/cab67daa3b0a127d0aa9a2069afc0611/2935327858.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1611587e9a0c8d---56376952310.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/puteduvatitekenumukaw.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/52500231349.pdfIn PDF document text
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/16712858886.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/60209222024.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f0cf716de8d3f7db47b7a77540845852/vivunebowi.pdfIn PDF document text
    • https://pmms-online.com/assets/file/33459884484.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202108301856511008.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/ff40445061d163fd52340da539830fbd/maxekaberujixirizogogoluv.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089796c8e7eb---famufikavifijumojazixu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a152e3b0cba---pebikizukokaxamaw.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/63054364476.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/30636359980.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/03831ddbb5867135c53a3309be800719/vimemagilozijujegulezowe.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608998dba29ed---38977070984.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607367eec75db---kabanuxonoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=identifying+theme+worksheets+with+answersPDF 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_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 10996 bytes
SHA-256: 3c4155106342360c3a6594e6a6347a10e8b0c3e97bf2c5eb08feeb63b43cb56e
font_01_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 18060 bytes
SHA-256: 02ef6e80e25d49c25b3e891fc8f54a93acc2e07a70eff8f0527b62501342d652
font_02_sfnt_off000120aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1