Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05fbc6b3f580777…

MALICIOUS

PDF

87.5 KB Created: 2021-07-23 22:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0263d56312e8dad0b3042e5568507f53 SHA-1: e1a98cd465b7b971d3dc03ec39419d0662030e14 SHA-256: f05fbc6b3f580777551a0769dc83399ba3d5e74d8608d4008ea6e49a2ca73db1
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 WordPress installations that appear to be compromised, serving as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function observed is directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/08pcaokds4oavc5t5regpr4gll/19970453852.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071d643d8dd6---sezew.pdf
    • https://elitstroycraft.ru/source/file/zivuxijonunomur.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bc68418adfc---3444004086.pdf
    • https://toskov-yordanov.com/userfiles/file/73020623909.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef0318d1c---fododulinaferawo.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070658fb6898---83509961582.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/040711b0b0e943279de86a4f99d9d8d2/zujur.pdf
    • http://bet-balance.com/userfiles/file/96465661364.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3f7d44779c7cae85d120c284dd3c4eba/wuluxagekubot.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d03315cb3e---tirofigegumun.pdf
    • http://bobmeetin.com/media/galleries/files/60106021089.pdf
    • http://yongqingtech.com/d/files/rabategabuzuv.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/59d0d43b1e7afea9ec592a8f56947dd3/39695182535.pdf
    • https://culturasiapamplona.com/guiarte_userfiles/files/wokopoxufuzuxorazogaw.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e513c947a8---vibezuxuku.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/40457787802.pdf
    • https://menlopark.com/wysiwygfiles/file/kivefaruxelijilazosimum.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/83699966365.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ecf38e020077e43672b76354d378bac3/17260105281.pdf
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b4cad7cc9a71cfc70e22c0e1ecc8ce9c/39380220833.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/sr0oumbq16lhnc0m16lvmvqgmf/pagadoreraf.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afad662f20b---28321637141.pdf
    • http://safeabortionnepal.com/userfiles/file/30361359569.pdf
    • http://hydrem.ru/images/file/giwojesumu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=de+donde+se+forma+un+enlace+peptidico
    • 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_off0000efeb.bin
447c65bcc42dadde9721ea159bfb637cc36a995df8c118eb2ea343ad61878c42
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 10884 bytes
font_01_sfnt_off00010912.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 16792 bytes
font_02_sfnt_off00012124.bin
9581bff048c9fc10c8f050fb6c38de18f1ccf03eb2d37541af68abec09ff4917
pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 17712 bytes