Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a88710b84296d21…

MALICIOUS

PDF

78.1 KB Created: 2021-06-27 13:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 606b0708c7a5ce90d6cad807c0169258 SHA-1: c305f9703d1cb65a2cac2cb26ab6e1538e7afe6b SHA-256: 5a88710b84296d21ff9082c126563c731c5c10e6fd01ff7b3e05e5c295855cf6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and exhibits characteristics of a phishing campaign. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, likely intended to distribute unwanted software such as KMSpico. The presence of multiple external URIs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6339

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=kmspico+for+windows+10+and+office+2016 PDF link annotation
    • http://akinmedikal.com/uploads/file/97905977180.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/34279490853.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/jqf7nii2q71r7jk4meen819rm3/zukuleg.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d619da7ec10---jimufesovizewaxi.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a1f7bb21f8d879d7b95c6e3e2e1aa54d/60236388037.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/95104174447.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/0tkekjvpkhvce31qk6i606m0fp/54569529093.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/0smmpq0182pip8dfb9dkmiocs2/94245883994.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160beca267bfce---9150244803.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/27840743173.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/6774744464.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/xulovunemage.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c98ac58f20---49402789867.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/jolezinura.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2801a65552---23091435482.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/rewimagolitexopa.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/jixasew.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/049fd870890b18b77eaf7bcd21523164/mexiwawazolobivezufumazi.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ae657708e5f---mibolulide.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/segajar.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f4926229---pofezifedodenusokozarav.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_01_sfnt_off0001180b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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