Malicious PDF — malware analysis report

Static analysis result for SHA-256 8337fe511727cf23…

MALICIOUS

PDF

87.5 KB Created: 2021-07-05 23:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dbf842b7128da31c64153373bb6764f3 SHA-1: d042bb514ae031552f46df8aae69230b43a325fa SHA-256: 8337fe511727cf23bcb6cf7834f64723e7b10307908574f54aa78dca55d1a96d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of links, many of which point to compromised WordPress installations and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs suggests a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution.

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 https://synerhu.ru/uplcv?utm_term=this+sums+it+up PDF link annotation
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/9fut99asmfcvvbtb2gqbe6k5bi/padigitanewamisa.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/d7d478e6b66b713ae48432f1dfbf1389/28993161535.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/puzeravit.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160be9bb868ac8---48433016367.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0d3cjoutnecqeuc3t9tbutn83/rolerewinidexo.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/882ea9f356989e6e9137918296b6835e/25861874552.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d71c34bb195---72988959008.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a63b4cdb1---11464290284.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdde6acfc88acf7c870d04be44a89802/84255746329.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8c0eeeac2abae002dc3c472bbdf033c/dojubekemovilakosobava.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/faf68d66e3aaacb2852abcbf8bf4849e/dukom.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/5v2lbfuj8hjlpu3n5185piekq6/1337586400.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/3e62993593c158403d15cdbacdbaf3ac/toser.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727f22ba5b3---sagugovowuzenasana.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba39fc333a---20735290492.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/50d5babdf8e75bcd617c2c0d74935eba/60840059423.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/mokilunemusibevelupisumos.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2821b6c6e56c42950db30fdf045b2fca/85055355337.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a031c8d89---48464947390.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870738f24b5---51691055224.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/44304739824.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/57241497618.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/puxonaxalunezugud.pdfIn PDF document text
    • http://chikatere.com/Upload/files/purufeguvapisagaribinax.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e61844595---86560316984.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d2c7c0aea---sifitulotolu.pdfIn PDF document text
    • 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_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 17968 bytes
SHA-256: dcdd4ebf9fdcf0b8466f37643052be9e9513252e4983aac658c11f12768cfb02
font_01_sfnt_off000121ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 9916 bytes
SHA-256: a30143580fd099dbd096939ab65a62548a44e9ed140529058157380494cbb3bc
font_02_sfnt_off0001378b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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