Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f09dc06be3f279…

MALICIOUS

PDF

73.3 KB Created: 2021-10-02 14:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ae5b698b5efed007e9670d5b9224796b SHA-1: d32b1d45fe55e9272f69af31702ff4aad4c2a7dc SHA-256: a3f09dc06be3f27993f3eaba0406e2c44f32a808a6f3c0455df35a957d05dc18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://aslplastic.com/ckfinder/userfiles/files/9657596905.pdf In PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/96556924555.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16149b1d3eb774---1589496674.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/93188845166.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/xujemajexejaxisev.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/mizawuwesewomow.pdfIn PDF document text
    • http://gibisch.com/files/files/31112824784.pdfIn PDF document text
    • http://signauction.net/userfiles/file/nonasovexezinerokopuzovix.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/77201229119.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/79770397173.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/mowesivaxipapufujefutuwem.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/xuxefeli.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/texaxadolokikusurakas.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7i2gul0rqj94k60mh9vj19egoj/53110387714.pdfIn PDF document text
    • http://goldmustang.ru/files/files/66581117091.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/54109006051.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da976ef1f3---zufevorajufus.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/zijufovanabevaweladunani.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/sexokusijela.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/76449294225.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/tupupigibisaxamume.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/zogunilopitina.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/88549959643.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/4i109lj620vb5dgs6cin5rrt03/pusozajepuz.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/67251191653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=flow+chart+of+sewage+treatment+plantPDF 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_off0000b907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB907 10900 bytes
SHA-256: 3bb9eb8510495092918d65c8ee3132869b25553263ccc30baf561866536770e7
font_01_sfnt_off0000d22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 16936 bytes
SHA-256: b982094cc93605c4501ba082ae708ead022f69e05b7b94e004113c21cd2b37f7