Malicious PDF — malware analysis report

Static analysis result for SHA-256 75af84ef1f8cd4af…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 01:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98949f77906aa2e00e1ca73884f6a541 SHA-1: f0b8d3b1477341af614242e4947474ac7548cb5b SHA-256: 75af84ef1f8cd4af0d2c4411aa7716833b94e38444a2881a1c10dbbad371fbb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm to distribute traffic to various potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://huntic.ru/uplcv?utm_term=how+to+stop+getting+notifications+from+a+website+on+chrome
    • https://penzionradvanice.cz/res/file/febapepujejuri.pdf
    • https://protum.se/file/sasasivamemibebu.pdf
    • http://a-pluset.com/userfiles/gopuxozunakotifexadek.pdf
    • http://civicwomen.com/ckfiles/files/76299756374.pdf
    • http://locthanhwindow.com/img_duhoc/files/97077391067.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/49637926934.pdf
    • http://srs-budapest.hu/uploads/files/70734652474.pdf
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/36158231617.pdf
    • https://traicaygiasi.com/Images_upload/files/roxufaxamikarimabafofaw.pdf
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/99101120099.pdf
    • http://anshan56.cn/userfiles/file/16308972361242182949.pdf
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/52260853293.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35434753159.pdf
    • http://alacartedesign.de/userfiles/file/woxeliv.pdf
    • https://rheinfurth.de/userfiles/file/7549482203.pdf
    • http://mlead.net/images/e/file/furaropuzodidotid.pdf
    • http://020tzs.com/baige/images/userfiles/file/31142716533.pdf
    • http://cartopack.be/Images/file/kefabubuv.pdf
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/pikuxosixilelewadaliz.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143782747448---59130900745.pdf
    • http://liyangah.com/Upload/file/fubupawipodulotonak.pdf
    • http://educaholistica.com/resources/img/imagesck/files/55754165211.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3e5e11503c6008dd4208cebbc2bf3960/83078718777.pdf
    • https://xn--80aesyq.xn--p1ai/files/file/94803805121.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138a881f30ca---37122129179.pdf
    • 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_off0000ea33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 16792 bytes
font_01_sfnt_off0001024a.bin
f868d6ef880358534eed99dffda388b908a655431ccf7d3c02ed755e196399b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 11096 bytes
font_02_sfnt_off00011bd3.bin
ce6bb9f0508e6b3d85acc3a54fdcd209f62bbbfe22a233a837f9c9c074afdd4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 16744 bytes