Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a2488ec652fec8…

MALICIOUS

PDF

130.4 KB Created: 2021-07-07 14:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b0b286c59417f4e81865142195a22b6 SHA-1: 5690a83a9fbcc20d6144abb172e59177a6dd3acf SHA-256: 85a2488ec652fec8aa2514158ccf2a7bbdad9b2476eb59bcd375cb6f64ed89fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73404e2174---97785707258.pdf In PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/akg21p8eppfmh19dbpj0qhr803/mezurawaloxi.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/divoweremuvedulodimoles.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/17728383545.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8fc3d84c---53765324035.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/9c0090a9781efa8c20025654a9d46b57/tujuvunorafadudoxijune.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608321baa0659---7156292620.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6d4aa70bd---39517908618.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828973e4331---mesiv.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/vizirawejigelid.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/pizonuberikelokuborudura.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/cde087811752cf0df40cd5aa823afede/nutovu.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/malaveb.pdfIn PDF document text
    • http://vnplastic.net/upload/files/tafixeweliguzamosuxax.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/67919238332.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/h7dpubcuihbd1m3b4jgj7fdrb6/laxanunedozobime.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b61735f1d2ac39d97fc0bf581a975096/kezukilugekakifimegev.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/40089008412.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/14516061308.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2a4da400---wisosomajulafejotavev.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095c521e3247---xagiwod.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c077c1957---jewuzibizorur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=eighth+grade+math+minutes+answer+keyPDF 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_off00019850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19850 10904 bytes
SHA-256: cb1061873e8b4f6744526c1e63c257aa80030503d619906dd2ac851cc548618d
font_01_sfnt_off0001b137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B137 18400 bytes
SHA-256: c075bab31cc1c4458bfacaeb8c80d76b2c24666b3b61bc0979d2ec2e271a7e26
font_02_sfnt_off0001e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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