Malicious PDF — malware analysis report

Static analysis result for SHA-256 8adaf1757c2b17c8…

MALICIOUS

PDF

76.2 KB Created: 2021-07-05 00:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00be8c8895e9d79d3f18b8506fe0c6dc SHA-1: 232887c1d838a60632dfda0584c569d79ee090e1 SHA-256: 8adaf1757c2b17c8d1a9a98ad58244ab2076106efff40dd5be6b95b7a19dcca8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or for SEO manipulation. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.darvidproperty.com/news/file/wuzatugesevefamefizon.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d742c1683b776d325c5bb31c723f93dd/ludumupux.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4118292a22---94140470167.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fa9ada35e0103e03baaad8ff842eab7c/gijamipipajak.pdf
    • http://turhantur.com/turhantur/files/95381746111.pdf
    • https://mudraconsultancy.com/uploads/files/valedimutukadot.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/totekibuwibodamonarizifo.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/tc7q5j9hlsu7a8bk30it9j4p5c/5186196066.pdf
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/bejotusit.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf5ee02e20---lawatomajalo.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6b0cd77aa4f3aeaa95d2580cdbd92d05/49182196203.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/gmg9kvvbn8uk0etqpu7u67cqvm/15334925039.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bd92c1f2ceb---86580431727.pdf
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/6153245996.pdf
    • http://pogservice.ru/userfiles/file/38010887820.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adad60b6e1f---modalojusugeduxi.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d98a7645c26---95254209536.pdf
    • https://pima-alarms.net/slicice/file/45212560398.pdf
    • https://bodegoncriollo.com/userfiles/file/83839253265.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/09ehd0gd8um3o6l2tlqb2mptmn/redimupalewuvadamotafosof.pdf
    • http://gocreate.termall.pl/upload/fck/file/dagazajanugoxu.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf2c96773---zidipowasula.pdf
    • http://hanboo.cn/Uploads/file/2021060205172070554.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=airforce+y+group+previous+paper
    • 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_off0000c7e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E1 16792 bytes
font_01_sfnt_off0000dff3.bin
7990c5b5a31f39fe46eab6c72e80ac2bad5efd8c5b305f1811d327bdfe038a45
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 16608 bytes
font_02_sfnt_off00010b26.bin
4b27148772817af7d39bc1eae173545a44f4a0e9f4a929117c585aa46c6e6534
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 10668 bytes