Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b8114a11410362…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 11:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d30e99a1af9d739bd1d9573791a7d02f SHA-1: bf1795372cd3a569e8d1f730d01a42c914131c2c SHA-256: b6b8114a114103628843ac13364163b8fb213d9d071911bca8742d09503ebe5c
164 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple links to potentially malicious content strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/692b94dcecd5bd579b6427fe9000e0d2/tadopos.pdf In PDF document text
    • http://php-lounge.de/userfiles/file/5950604804.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1107839d4---kesiwe.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094325de4d71---38671909384.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/lunulizuxaxuzom.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6d16ecd82cc555cf9e67387f55ec0078/retuwu.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/48883697804.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/ur15jpqs8l6bnuqabg73lojrco/79205467078.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/zagefafefodiwizowipes.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df5138995e7---poboboguxodibarofowuwajaf.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/n8hdlakh7msq2vnscac45gid35/vupigo.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/167ecad11e81dd026b440b624b0cc9b0/bufuvonewuxixexepuj.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/juziwibunaxale.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/57279804936.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/27352537930.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16113eb9f655d7---pogofuzesavezufexemil.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608f62794afb0---67280921497.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/voxufusuwekubowosamexizav.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4bribi9icvkrf514el3dj94hfa/gomonadabeton.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/54782206019.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/bokesobabunetipe.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///72748620083.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/zufemefovuzelusuwijimeg.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/af23ebef7cb7bf681c9f988a3e01c132/54246528281.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/41u2tv7kaf1qrm24b11bh7n8k3/sinunewikubemoredet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+other+side+of+truth+questions+and+answersPDF 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_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 17872 bytes
SHA-256: ffa9ada062ce64f873a04fb3bd0da7d857e9836c821eb15445db0f8541a88752
font_02_sfnt_off000138d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D9 10700 bytes
SHA-256: d2fa4a2b9ca75e703fe5e25c51abf32981c358733af3bb7df2d8e9528850db65