Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c6f0f2a197d2a8…

MALICIOUS

PDF

101.0 KB Created: 2021-07-08 08:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d985ae0695f7848f945acf348fc2e14a SHA-1: 7f4a1dc281233d19bc2598fc4ac78040392da949 SHA-256: 99c6f0f2a197d2a821767ae49c7b83da25b5777a18d8ca27551b56f1f36f7146
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting a phishing or credential harvesting scheme. The document body was unreadable, but the presence of numerous links to potentially compromised sites strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10b4405e4b---nasekikav.pdf In PDF document text
    • https://mariellatriolo.it/public/file/28613329643.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/370b02ec615b073482c7d9698ca8fcde/kuraseniduranirak.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/0ad66d8f29ddb873dda05ecd0ddfd9b7/99270233185.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/tufoxoboparitotubojobuz.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607288397e347---58893498158.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/lumazobivepijoziresaku.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/65526410410.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d83a538af36---puxuvapikaxerigozo.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/dixaleminivuwedemano.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/nagatamobovowitafan.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c3c2c2c98ceda08e343301143c66b88b/94871678769.pdfIn PDF document text
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25a45224c5---35999949874.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077a0fa767a3---89042473852.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/nugurep.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/19124619513.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/5100088923608f7ee68c4fb374915a19/95934581406.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2b126d24d033e2e91bcfac628c525ab8/nigodolabutone.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///54958301653.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d32f5f640bcc485c45bcebc6957cb310/68432920765.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/63459556087.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/eg07l424sj60goblbdbod9jnf2/figukoxitigudakiguzikuges.pdfIn PDF document text
    • https://papiratisk.cz/soubory/wewitumovavuzunexurivu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/08e53f36ba919af25d948e9d0daec5a6/pazufikesali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=introduction+speech+attention+getter+examplesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EB 11116 bytes
SHA-256: 986da1c7c950376ce11ca01da1a45e7dc051417e33071f1277d6a9b4d7b99048
font_01_sfnt_off00014177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15989 17220 bytes
SHA-256: 237ff3c8cda31f34d701d6b94eb00ea451398b2c0a094ecc0da907998c42e53b