Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc80581dd6bac766…

MALICIOUS

PDF

127.4 KB Created: 2021-06-30 10:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b68eb52f459ad55065c3a7340d82e253 SHA-1: 8cd6ef162a593ab2c9ab26f2b4e40ecd092be31b SHA-256: cc80581dd6bac7663f0b93e3d3885d0947aeccc8c303c902e6bd2e3d269a08a7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. The document's structure as a link farm suggests it's designed to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

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://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba4d897830---92898712979.pdf In PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/c0c21pm7ci7vu2itk2jmtd005g/53630076848.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cfbe9421b---pofabekofewa.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c3102a18a---namilekin.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zobokabadi.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/taxawonidenuloxowaxoketot.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609456d3cd247---86344561334.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084df9dc7fee---24199221913.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c281968f4cd---xosurizapedaludimo.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/f056b763966e082844287129732d976a/ziwarokigotozezaxu.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b811ee5b408---gipakotamivozilek.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaafed667---bovudubadiniwuxanoju.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210608024510.pdfIn PDF document text
    • http://greenld.com/userfiles/46205422624.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/30673370866.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/4e250fb84f25c51f4034f614d974b47a/80623970327.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2aa4064b03bb7a8ace2c25a32f05148b/57438925867.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854a285f32a---38985886214.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ceee3956fb76d12343d32aaca6d242a5/gefedetotunabumosapewe.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a51c6279c23---paliwovirigamijasipejel.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06e8491b10d5aa554258d2573666598f/repoxulogen.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1c18b38b1916f6c9afa6a2322043d998/vurizazuxilefarorudosobe.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4b4dc1883156624699bf9d9d34c51559/xuzukapigepefibuferexan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=synagogue+what+religionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000184bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184BF 22240 bytes
SHA-256: 50c1835d8dc23108ddde9dab19db901f401de0f7b0f038371857f848e474e4a3
font_02_sfnt_off0001bc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC18 10596 bytes
SHA-256: ebf2f4112cce233e6cff40a77b837a7f2c80839058dbf79b75f71896f2e8aaf5
font_03_sfnt_off0001d44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D44C 18188 bytes
SHA-256: ea9988ab4bf9f1d2ff21a739ff81fa02fc5e2f1466fa556d41ff0bc43169365e

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