Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b23381826861dc…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 16:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 832813cb1161842d31fd5b27b8103dba SHA-1: 6bdc231cd5aae506acc4aa3b89213ff941d5e901 SHA-256: 80b23381826861dc29afbb0418bfe64d5538ffb023436952ebc5e85c6592f99a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=aluratek+-+istream+universal+bluetooth+audio+receiver+manual PDF link annotation
    • https://hirurgija.me/files/topuderamo.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/65a47114eb4183c445eeac1f3ae6d551/bixulizudo.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/7052641115.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/zifil.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/19624552763.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/qshuk5mv033hngshpp835uk1ec/gitorer.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/59328029157.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/94008458217.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4af2ec9dc4ca70e1cd9bdf0d4c659e31/gosokazeg.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/savojelumivulafifenojoji.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c633ba403fd---28939007079.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4f1870e40---gofepe.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607184143f258---xebiwixuji.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/85494215250.pdfIn PDF document text
    • https://numberonerevolution.it/file/86104070714.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/389e00f86a40ff0bba7fc6f1994703c8/67078248795.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/53249589879.pdfIn PDF document text
    • https://thenavyaindustries.com/ckfinder/userfiles/files/nefedibujosivokugedeseja.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/94265878717.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/cf0aa64c8dc3e777fbeebaaa47fc26ed/58543963728.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/tukunesekurutunonoguwasow.pdfIn PDF document text
    • http://www.siposferenc.hu/html/81192550930.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 16748 bytes
SHA-256: ddd77aa40f718adede13da91773bad9c8ce12759e92a5262f6d01259dc80d8b6
font_02_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 11048 bytes
SHA-256: 90108514597102c63b76cd911c07a71d52228df34cd1d1b693e3a1d070c5f7b7

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