Malicious PDF — malware analysis report

Static analysis result for SHA-256 a440e0de5b7b1f68…

MALICIOUS

PDF

95.8 KB Created: 2021-07-22 07:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40996bd0aface2db6aaead6aa241113e SHA-1: 262835e0e8088db06995bd59b8c5a7866ca7a85d SHA-256: a440e0de5b7b1f68bd78a453131be152990da6d0f1fe78f2ea755f5cbb1ffd89
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://gilbertems.com/videos/file/mavenazegezewanazurelozew.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/b11032024da545dd13832526f349eec6/migezule.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e63d2c5cf4---nonivitopuredusobanofob.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160705a6becc46---70832039444.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/f73ml971qv2nrfupcq4soh7a0u/47337757803.pdf
    • https://smartstone.ca/userfiles/files/16910231476.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff7d1dcb79---mefusiluvojane.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ceddbbb71dc---nozobujixaparori.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/766h4hd737r58nv4n80q329t13/gobelivewowemi.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160989ed1395a0---6075599055.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/q2c7dc67h1f1ks6s1qm0ki5ike/66712863856.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fb62301b1---pegusela.pdf
    • http://dongsachhanoi.com/webroot/img/files/42837111515.pdf
    • https://marljivo.hr/UserFiles/files/5700760519.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67aa9e5359---66183444739.pdf
    • https://free-spirit-city.eu/uploads/wysiwyg/files/pelunidagelofipifunomov.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/e073340197ed300a9d6649ac6ca4e7a7/sokediporizubiwuwavunup.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/co8ea1td24urdaltk12s20v641/82662687874.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/6e9598b990910b66b572189de8258b92/99419597302.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f36619e4146---44335673187.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/a2bf4fdd2aab852da34ce687b9f54b61/41260729407.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079b3605fdee---papinagarimuxijajol.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ieeanqf9hi73vdg48pq7imep1k/bawov.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/88b0595c1ea103aeb53eba207fa383fe/vevekofubenu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=world+photographer+day
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114bb.bin
1058eb75224497a33c0b3f7e222c7416550733de36c3d3c048a59f0f21b377a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 17128 bytes
font_01_sfnt_off00014151.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14151 16792 bytes
font_02_sfnt_off00015968.bin
c5fad55535a12019a781d32af29fdbb714757324eddf43cf56f0358fe9d33af0
pdf-font-stream PDF embedded font (sfnt) at offset 0x15968 10416 bytes