Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1ab7db1aee66d5…

MALICIOUS

PDF

92.9 KB Created: 2021-09-01 00:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 352b5611bde1640a77fdb5e18be0e3bf SHA-1: 27496c7802e0fcad4364f065931ca7a6a3c766b9 SHA-256: 5e1ab7db1aee66d5443079dc7798d0b967bc8adb79ff27f08df48e3dab0395b3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The presence of multiple external URIs and the nature of the heuristics suggest an attempt to redirect users to malicious or compromised sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9229

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.farmaciapenil.es/userfiles/files/mosomivepevilelosedimeg.pdf In PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/658b7caa7d3d4f868f1df916e9ceb581/97296137279.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/40327656121.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/910a258df3afc354a60a3511c74c6e5a/zukesojodibebufigatala.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/nsp0hl6t5i3meohfuetlm2ti43/jajamagegome.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6acb4a621---71787592029.pdfIn PDF document text
    • http://cukrarska-vyroba.cz/UserFiles/File/34122358449.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/41563663938.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/tta1uc3ce7fdu750g1pdb1gfvn/4554014154.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24b8f58c13---87620753705.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/xopuzipiwux.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///46658407066.pdfIn PDF document text
    • http://usa-ex.com/images/blog//file/23854336590.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/gupugosugobisomogi.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/suditedasawozefozonole.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/gimowokimuxul.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021070118035225.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/burukudukofasewuvegi.pdfIn PDF document text
    • https://codecs.roimages/file/kewafobinabokovopabinov.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aff80acb64---tawebagesobujuvujituxape.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/84213201763.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096858254cae---90010515270.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/71405171132.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b01b3f6db1b---simisugasudiwemesepowezig.pdfIn PDF document text
    • http://distributoram.com/files/file/gobogifipivebuwep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=jerome+bruner+play+theoryPDF link annotation
    • 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_off000112d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D8 18532 bytes
SHA-256: c31c91e6058de01e902329c46506a9fb40d5d7bfc47864e6d1c64448ac966819
font_01_sfnt_off00014320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B37 10604 bytes
SHA-256: 9db88ca8d471b9de8732dac8d62f10dd03a447550ea7d8c8b4ac67b74aa48e3f

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