Malicious PDF — malware analysis report

Static analysis result for SHA-256 c605871174e13108…

MALICIOUS

PDF

85.7 KB Created: 2021-07-07 09:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38e50b0867f74b0f2081103eb3734133 SHA-1: aa1c35cbef68c267807c8013f8aee5d83140ad83 SHA-256: c605871174e131081f2ba2718f11dd15a10dda5f63d6d1990bb86362432078de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

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 http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/10ro6vov6f6vem8tmu0dnn9hg0/28442286561.pdf In PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ca67da75---48869023964.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8f55120a---fijuj.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/besabakur.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/7551848871.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/suzulaju.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/af64cff0670aba267cc373d1911d283d/77584532655.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/16513219917.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/45470615593.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/liginesena.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/97801967504.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/19894526912.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/lilemeraruginifow.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/1e309b5105505761c1f9dd6c35de9e96/remolujever.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7237a56ef---sexesewerujakez.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/wiridire.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c757e0524c2---zavudusa.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfdc6e7754---50986878351.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/srlkrl7s1tffjth5liidurin53/bedar.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/da02dcd02f3b0b258db50ebd163f157d/xuladowenerozuliraju.pdfIn PDF document text
    • http://alkanboya.com/files/file///mimafomefexusu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf7537e01---wirirejit.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/guzub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=music+channels+for+directvPDF 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_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 17356 bytes
SHA-256: 63cf1cd89013f223238fec1760ab48c1fd6125de8de73935c54bdee5605313cf
font_02_sfnt_off0001311b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311B 10732 bytes
SHA-256: e9d9bdd491a4111afc54a9b12150449dcc7241399ecce851d7aa0a3eec02117a

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