Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf67cf80bbdb9641…

MALICIOUS

PDF

98.8 KB Created: 2021-07-15 20:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec92611108be0a4e0a17505601a6bee8 SHA-1: 78e1ecff38315223a071a5c2b8e2de4c91cee8df SHA-256: cf67cf80bbdb96413c994f314c8da077229298facca1f41f12e672408cce6487
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage, with many distinct hosts hosting PDF files. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/661a6dc5002d45f9809ed59e2aeb010b/jizosopebixifozuwajib.pdf In PDF document text
    • https://autosaloncenter.com/uploads/files/81134639909.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/29469923274.pdfIn PDF document text
    • http://sam-global.info/files/file/guxaxanevarokulobevanijij.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/d3c2f48622613f576ca50aba19eba07a/35067888554.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/051001477214.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/30216856512.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf2ba8260---81155660908.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/an6jie8q2v277bqck05bjslp2n/96449077205.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06d078bd6---warurugojapomaxe.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab65b01b235---96496438244.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e07a8e125---5651493216.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/wafususajuso.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/13078464185.pdfIn PDF document text
    • http://allycatering.com/userfiles/watugitit.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280059088615.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b419d06f45f---fuzidugezumujonije.pdfIn PDF document text
    • http://oodow.cn/upload/file/2106121322207643512iaj1sawtkw8.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160921f5559180---73218582271.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/16c40490206ba4393fce006032dbe4d7/fewovejujejorararupi.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79e07ce95---kudorarudi.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/82759880642.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e5d1dd9c---zimuxujajolomukitota.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16080202430996---13806742001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=secant+over+tangentPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 19776 bytes
SHA-256: f2f15f18470f9db3331a54d1052f511b285dc4080f9e9af03eb0195006077a55
font_01_sfnt_off000138d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D0 10240 bytes
SHA-256: 9c67358267fdf3c63b3636430165ae48ec1a91ce7b78c35f6866e1acf794871b
font_02_sfnt_off0001500c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001681d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1681D 16152 bytes
SHA-256: e6aedca6baa4f52dce5402eb6cae42210c59d09bb580fac165c54b04f8c67907

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