Malicious PDF — malware analysis report

Static analysis result for SHA-256 26734af5c040057e…

MALICIOUS

PDF

89.7 KB Created: 2021-09-06 12:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 357450aee12da580aca27a4458d4014a SHA-1: 8161bdda85741e72542b3ca1a0f9525a6505345a SHA-256: 26734af5c040057e5e47ef97cd9491f7f83a4df8a47eeafb1e64576c7534c12d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=ptolemy%27s+almagest+pdf PDF link annotation
    • http://anticacarsulaeborzoi.eu/userfiles/files/62097122093.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/ecdaa8d554857c45c235736244712501/rogolukir.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/tamurasal.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/57096782704.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/metuku.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/88923198687.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/bejoxotixati.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/pvtouj0sl8dpbdqke11bnoq0a8/26878786382.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58d080bbe---binupilamojukeke.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/mifivibejuwenu.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/51095192925.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/6376103588.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071caa82d937---notok.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/56732651017.pdfIn PDF document text
    • http://farashimirooz.com/files/nobokefojoxafazida.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/vokalogazizawafaka.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b2c65f6067f---woguwibuzes.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6d9f70919---mufemepeligewinogidojetar.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/5fc90b3f933b41b8c04baff37c0a139d/86056928401.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a1990fa0c58---zanuzememusurapotez.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/42919438108.pdfIn PDF document text
    • http://weiddy.com/uploads//files/202108021859074761.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/78165759966.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/ledodigirosefilu.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_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 21712 bytes
SHA-256: 7acce228a14c08b8d9e428d3a7831a6c49bc96583d98909ae8409cf3a23f9bb0
font_02_sfnt_off000140c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C0 10696 bytes
SHA-256: 090fe2bccfdfb8da12ac78e3198b6716dee52b6506b7666ae49724495d64e126

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