Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44206fdbe8d10b0…

MALICIOUS

PDF

114.7 KB Created: 2021-06-28 08:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a4057ad790e80d5865188f51bc6fea12 SHA-1: e1621eb958e2c17a9626640079ca770d286bb9c3 SHA-256: c44206fdbe8d10b06d9cdf457cefa0f6b00a14da4e8c14ce149ccb9c133ecce4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various websites, many of which appear to be hosted on compromised CMS upload storage or disposable hosting. The primary function seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://drafthe.ru/uplcv?utm_term=final+fantasy+iii+nds+rom PDF link annotation
    • https://colakcivi.com/userfiles/file/38841721781.pdfIn PDF document text
    • https://baongochoa.com/upload/file/93780732064.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8312221e4467f9c87063c47a07aa3767/76168821610.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bff80cca5b1---putegomufewasukejasizolu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ccd0540463f2e3bdf81703f697b1e4cf/naguxapunofumoxe.pdfIn PDF document text
    • https://aspirans.com/files/file/depubijisolire.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c9ded766cd46867d9aa623591dbe0922/nivurabakavanerijamawuwi.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/nuwaganurigejegovig.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1u3meap59cog0fo7oama641vh8/23233176805.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/adbabcf713e9138caec25ea66af09d73/seveligetirizuvejalop.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1ec469ba59fc7e9b7ae31f591a16cd00/wifaw.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/deladezunofufavuwa.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/toxebimalubediginagu.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad398621d---rejibopaduwupiviluj.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c583a9da2c1---54436601969.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8d9f58497---fapitoguwuvumilinarimexug.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/86107354964.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3ebf10c3e---4121853879.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/v0ktoj94n1mqpb217imhhj5ufo/27497792254.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7954da8a0b---88224813484.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e57ec8bce---nelitedasem.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15581 10744 bytes
SHA-256: 20ca3344259d5ecb4863ec37fca06914c58287d5c0c78f29fbbd45eb3697a301
font_02_sfnt_off0001784e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1784E 10472 bytes
SHA-256: 4239289a1cc9f6f345c105d1ce3690ad8f16ae88d21db5d3a2caaa8eb906f6e2
font_03_sfnt_off00019006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19006 17440 bytes
SHA-256: 094d62e8bdc22346d607a33d62459621a9a51ef8b860fcda558afebd8cf4bb9b

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