Malicious PDF — malware analysis report

Static analysis result for SHA-256 71392bde68010efe…

MALICIOUS

PDF

99.0 KB Created: 2021-09-16 17:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 769cce60c707359a3d42ac805a4417ed SHA-1: fc4ecaa34af07afdc65998db3290f846c23dd294 SHA-256: 71392bde68010efe416c2a2280fee895f821cbe997b5a3057f8fd948ce677128
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links form a link farm, a common technique used to redirect users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9374

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fuerst-architects.com/uploads/file/pifunowi.pdf In PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/livegumidaxazag.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/d62ba7b17bedd29ec094492a3ea60a8e/puxotifizufudebirado.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109102249331369.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a72f56b588b7a687738aadfd402b72f0/6554038166.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/93260911461.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/fusejajokawa.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/roziwugifisiwesaxulip.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/teziv.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/31ae4e10355116cc3d248827a7e7089c/86301531898.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/telabawuxexizokoneni.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c744273509---97544288281.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210906_87D13D7689366C0E.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/75531854305.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/70848895408.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6204b7155c90bd32725a6444caa5e945/fenofoj.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/xurujusep.pdfIn PDF document text
    • http://philipsphotographystudio.com/savujemukekudafogaj.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/41012570973.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/5525707273.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/xiduz.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/42155223bcd7c747afafa55d01c0463b/98075204914.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/vijikemirarufitufeweted.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/13865876901.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/xefetelurirevudaraleg.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/baf2fb86253b9aaa3a9c4a8b875da5a8/86357986125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=browser+web+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f330.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF330 16788 bytes
SHA-256: b37e79e0e5a2901be625b906076b2e2fc2ea99dfbede281950a45cbe7a424c4b
font_00_sfnt_off0000ea1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 1964 bytes
SHA-256: cb83427253be486b5dc35224710cea1d2a27078ad6da64da340d8beb93dbb3aa
font_02_sfnt_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001230e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230E 26500 bytes
SHA-256: ccc0bab25e6904477348e2d1f3e1da09ea7d69375d7a05038706c5e08cfb4b31
font_04_sfnt_off00016592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16592 10376 bytes
SHA-256: f5b3451201fec6f5802d9e668737b5e1e4d2256a857025b2f9c4cf16e9ae75f1

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