Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c11dc579ea23a9f…

MALICIOUS

PDF

103.6 KB Created: 2021-07-25 21:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 74558de2ee38f8fd09486683245760df SHA-1: 3610aaf0bf5dfc70cc39bce8a3973659686d38d3 SHA-256: 9c11dc579ea23a9fd910ca47fd62fdb4c33b23e71ceb6e9b755db372e595cc5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://softtox.com/new/userfiles/file/jowawuvixirafip.pdf In PDF document text
    • http://langeline.com/ckeditor/upload/files/78939465358.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f6b55bbf---xexubuvuketulelamam.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/hp50llcqunnmrq41rf97504go9/96148661347.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b7ca02df0---17181195539.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/doxadisizevosifujugafivo.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/zabonemawos.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/mawuvutapimafa.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/9153144575.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf6819b6e---judedelabosotiluketorexof.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/raxifuxekuloga.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/32023420741.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/xufazunokorawopibefosavu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffb5c669ee---92200731126.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/abf2e331739b651934956b6a9c38a149/gopiwa.pdfIn PDF document text
    • http://mastersequipments.com/ckfinder/userfiles/files/somedawukekajok.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/86911446694.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/xalal.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/40675123796.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021513113405397.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/39191357956.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160da1a67641c0---berebubotubote.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3d3c57df396ee2c962055928677e9cfd/tazudurasako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tecnicas+e+instrumentos+de+recoleccion+de+datos+encuestaPDF 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_off00013049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13049 17844 bytes
SHA-256: f05680666d98587875e2928c6e78eeb01f9bc7b17ad77d49d732a392ec455fcd
font_01_sfnt_off00015da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA9 10596 bytes
SHA-256: 76216523553e069b9bfa406f8e618668e99df20cb5bee5c8ab4252d2139068b0
font_02_sfnt_off000175da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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