Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82ee2efb24dffb1…

MALICIOUS

PDF

95.9 KB Created: 2021-09-03 16:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba2f05961a9880416248f8e6dceef9da SHA-1: 381b06df59f3f1ecb9122d89d3ee1bbfe986dc91 SHA-256: b82ee2efb24dffb1ddf875ddac1654694bd4b45eaa023d659e4b3f3ab3f2e014
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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://masukpt2.com/contents//files/99462807269.pdf In PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/48775071806.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/73620267773.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fafcf300ae6---zipikogoj.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f55ffab8cff---gixotiwibejanin.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/17661270418.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee8406650---gobejirabidowi.pdfIn PDF document text
    • http://abworder.com/uploads/files/50959557440.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086beb533cf2---37520651263.pdfIn PDF document text
    • http://df-foundry.net/d/files/titomeropedupez.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4297abcb0---pezejesola.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160755eb6d61ac---77516123528.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/51441323852.pdfIn PDF document text
    • https://servicepapik.ro/files/roliwogojule.pdfIn PDF document text
    • http://asid.rw/userfiles/file/90183232994.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/9811092672.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2de729dc7---88264252040.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16079626d8cd2e---xofizanepegogeforosopusus.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9155a482b---31286266918.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/xabigokepe.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/cd4cd8p67len99gqr8jrn930o2/xiruloxabatazozilidubuma.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160db7bd31d62c---91014191843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=livescribe+3+smartpen+manualPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161065b9ea32d1---93299334661.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_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 18980 bytes
SHA-256: 5381a421e9f9c0bf08a00f95a31e5f5e8ce389ca8ffe57743d0483fe6481a635
font_01_sfnt_off00013f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4A 10852 bytes
SHA-256: 14b5667bdef44a7ee1e0a4289c67f07f79c025d30ab0eeab82abb9bdea6b69ea
font_02_sfnt_off0001582f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1582F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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