Malicious PDF — malware analysis report

Static analysis result for SHA-256 7728baf773c5d909…

MALICIOUS

PDF

87.8 KB Created: 2021-07-05 08:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fcd72fc3f7ce07ebb9ad1ca0f0ab24ab SHA-1: 9e01e4e899f39a71ce86963d9926b945487bc973 SHA-256: 7728baf773c5d9094764e985fbba6a63cb4893923f864fa302a8e7788c7e08e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest an attempt to host or link to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cbfd1cdf8---soxipegaraganizo.pdf In PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/zuzub.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/4pnm1en538ci1g5bfb5l9t0dn0/fonibonedexalaso.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7240d7c29b11580e9928bf7bf7019468/bizaxezubepuxotifenojile.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/83385431496.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160915f36549c6---xumewe.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/todajabunokolafikifup.pdfIn PDF document text
    • https://yellowstonewildlife.com/wajegabe.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/rawurojurudeso.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/94799310914.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/bupupepolidirafojipi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9e03c5d0---72388998197.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/weginuxonakurebaf.pdfIn PDF document text
    • https://t2sc.me/userfiles/18809000126.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/8801649795.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/85789562068.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/l50t2ikbeeq1lci6u0s4krl004/18181957934.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210608234227564.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/dctujaklhjo6s91snpd4l3nrbq/79821859275.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/pubonarosibupuso.pdfIn PDF document text
    • http://rentaruedas.com/files/others/fabuxifo.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070478f15acf---lanigipidejezuraramuno.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab20616fb50---medejunirujofinediva.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/298213b22c72a50253db2670c2b69e6f/fivimiremedibibiful.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/22008313257.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60e507313---natazawuvefubomuxaxoja.pdfIn PDF document text
    • https://avela.md/userfiles/file/19691091758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+record+your+face+and+screen+at+the+same+time+on+iphonePDF 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_off0000f2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A9 11132 bytes
SHA-256: 77c6d79909fabd5c10af9de4acd5d33de27e79539c0fed0f34ab25c16c1fb397
font_01_sfnt_off00010c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 17160 bytes
SHA-256: a5f372c708d9873eab3a5b6c493d927ce684e85366a9f6c50ba5d403ce7f2878
font_02_sfnt_off00013950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1