Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac081131acf9de79…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 02:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d15c1de3c5a8c8a2dd42360da093146c SHA-1: be600c2b339c296b725c3b2166841b1ccc25e7e9 SHA-256: ac081131acf9de79a467f39d9aafb7478dd11bd8e3458abb39616b97b354a939
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, characteristic of link farms used for SEO manipulation or phishing. The presence of these links suggests the document's primary purpose is to redirect users to external, potentially harmful websites.

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://papiratisk.cz/soubory/75762467799.pdf In PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e665b1f86---kofoboloduku.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/nobaguvoxif.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/guwegikomozib.pdfIn PDF document text
    • http://capri.lt/userfiles/files/48356333449.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae2ae8aba---tunoris.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/vuvafoberugunijanedef.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210731202044.pdfIn PDF document text
    • http://mp-journal.com/media/file/xumakepa.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/77776807263.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a85b0ac1c57---namep.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/wemunakojokawepa.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/n49t61a0reo6qdv1o44ae12ru4/rexikokalopezalonukonide.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb30cf40ef---fonafexewagebarefidug.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/wazodopaziniwizanakezer.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/wapugepesipax.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c326acbca---fegeluj.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/unej30u46hnigict8gtub7cam7/waxal.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/gegotufuzidawilusi.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/wejilonawariwosukukidol.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/seripima.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1c373edeabbfa26dbe97ce7cd445ff73/42676247260.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/67b3a99d3e58f608b12c2e5d239f377c/30277863341.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/78524540806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+screen+record+music+on+iphonePDF 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_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB35 18124 bytes
SHA-256: 17c00e7a4149b56747db3da807602c3733eebb1281d0cecea3264a8d00e015e3
font_02_sfnt_off000129ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 10748 bytes
SHA-256: 135cc3b5d5b91d9bb7c3dcb99211980aceda8164c7862cabaa39b24604869386