Malicious PDF — malware analysis report

Static analysis result for SHA-256 00af3e2041d5aeca…

MALICIOUS

PDF

81.4 KB Created: 2021-06-26 16:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a4b8a90fc41eef5fcfb6f52f443d9b1e SHA-1: 708532341f606c4573a4b1e53b2540473aa7873d SHA-256: 00af3e2041d5aeca5b515aa7e5983c8a08e52ec0085c4928cd5fc953060394bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external links and the PDF structure point towards an attack pattern involving directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://imagebuzz.net/ckfinder/userfiles/files/70526598874.pdf In PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1df84264d---53583299366.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/643b69bef22f94547afece3a6469a6e9/15002203796.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/cbb07443c88bb98736ee4927474491d3/43593477724.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/rizosubapa.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q8f53nlr355d7fgskbih6dk4fh/143408023.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/088ef18cc562cb671e6047f074b13162/foremoxeresa.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/444unvodsdjsa4tf01gnerainf/fuxobu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16079eb0429f39---susigepujeverorin.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/97396002786.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/daa4f319f1870afe7f2899cae54ab10c/direxu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a2cd9e9e1625dbdb58173cc6f8b6be6f/lipomumitiga.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/40590497538.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/timaj.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad6dac9c0---kaxegatijakanavujepov.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/50211240423.pdfIn PDF document text
    • https://asi-filter.pl/files/file/16172078640.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c3fc7e55---60837100062.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/sodiwositetalofekamizem.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/826602a5a1e9acaf68782b58ffdaa7e1/jirulutepojovakanozowol.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609162fd9c21a---46143766712.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/29869834790.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b0c68a10ea4ccf432de108b87c83ac89/73013468766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=yellow+line+to+expo+centerPDF 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_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 18540 bytes
SHA-256: d454b61243d41087c34e8c752cbdf75381f0fbce49b87a22715343d2e9724199
font_01_sfnt_off000107f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 10208 bytes
SHA-256: 4bebb47de0172b2ea16c3b19987f10b626676d0649123f54f53d4171abd2f83c

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