Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c44edd8205611e8…

MALICIOUS

PDF

97.9 KB Created: 2021-07-30 13:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1fd9c273fe9f84f6c0656c3339c4ffdc SHA-1: 61026953f64e3361ed15ba0589ae45fd11bacb7c SHA-256: 3c44edd8205611e845ad89ae67f3053c6170f7e63815f2bc0ea3080f79ea3dae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious or phishing sites. The presence of compromised CMS upload links suggests a tactic to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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://griswoldremgmt.com/uploads/files/loziv.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fbfacd2f7---86894592192.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/noboxobinesuxujobiv.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/najataba.pdfIn PDF document text
    • http://normel.org/files/upload/file/gekujonidudabepuz.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bff71eed1a---11377631184.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb429ad596---keralobobovaxolurajozedoj.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c018c1e370---81154924204.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0722109e8---puxumu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd3d2a655---92115182240.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/jijarekoferetiwujog.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087ccd775cee---31622700190.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3b5k67rn6qs5043l7bdqm82ar8/43526348940.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/16779951033.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef7bb60160---gukapinivenuzonejedusagiv.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/vizugevonipawi.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30c83256bd---basofame.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/36987975293.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/viwujolewugorukuvow.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/030045361330.pdfIn PDF document text
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/gituvizarajudapanuzuzexiz.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b479e678---79373361917.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/9f7a1e35a50f2e101bac702701bba66e/7009990905.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b74251db55---40794099750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=suma+de+los+divisores+de+12600PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 18112 bytes
SHA-256: ca33b7b7d9ff60d7e89684a39618f3906bf6a9619ecf82008bf3a97a7d9d4e91
font_02_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 22380 bytes
SHA-256: a842dc84666fdf884833c9ef4739ef95391a7f117f137887c343c68e9c950124
font_03_sfnt_off0001533e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1533E 2428 bytes
SHA-256: 5bb42599ce3bf274aca94c8473982491e12d60a63e8dae5329ca44275d16bc13
font_04_sfnt_off00015de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE4 10912 bytes
SHA-256: b103e3df0671ebe9b2ea474c81f2023947965e3acdcbd9a6863d5fb106358a88

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