Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53c167e95094542…

MALICIOUS

PDF

84.2 KB Created: 2021-06-30 06:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e4f313ab9f3ec96bcb105218bcd2fc2 SHA-1: 2ab1e865a656a9894f86617ca977ac7f476b0aeb SHA-256: c53c167e95094542caff6ffb95bc63bce2e710cf39b60ec791c73c463f010fa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites. The PDF's structure and the nature of the embedded links suggest an attempt to lure users to potentially malicious or compromised websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://aterhesseg.com/up_image/file/wokadoziwejapoxodago.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160809204c7ecd---50189002217.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/25262387837.pdf
    • http://www.radanhorse.com/resource/files/62208198923.pdf
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/2039455577.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d8998245---39566955317.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7b400e358---sobaxojatizawavetuzet.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/4326b162f145536b2691477742e5c0a1/1158078502.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e430dc339---69644320483.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/jqjhgim1iq5nvi36ov0sjbjhep/13756456315.pdf
    • http://wjcopy.com/upload/files/tesutoxafavitol.pdf
    • https://vydavatelstvoklett.sk/userfiles/file/fekijevemeledazad.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/tkammsu9s3fd5go5ub8pr6ko6g/vulomesodikexemogofigizu.pdf
    • http://caratow.nl/userfiles/file/lelupesixugedeno.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd49f8929c---zinibimevuzesa.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/ed522cf37b9e95dea938048a7284c76a/sozisu.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51add9380---10117959898.pdf
    • http://studiobardinisrl.com/userfiles/files/foletatexafigetajopakok.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c97c8520e---18161820480.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160840aee87a8d---5982287845.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/60e01e363021d927d16fc9e823d10db5/jobuz.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093b1490e12f---zumapimogezob.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06f9d526c1---57816378212.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078e3f910bf8---sosim.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=limits+of+fiscal+policy
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a9.bin
4fd9c9bac903e8d14e52a1e1a5b8904bdb2aad8f3cff9b56114864ede1a0f087		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 17028 bytes
font_01_sfnt_off0001140c.bin
ac14df2b77f3b19c9880b5fab194c702dc8013eeb6d719ef4c15b788c7f80907		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 10376 bytes
font_02_sfnt_off00012b9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9B 16792 bytes

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