Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0d2dad17008d35…

MALICIOUS

PDF

87.6 KB Created: 2021-08-19 22:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 617c42df61114cf7d06d0edb3fa393ac SHA-1: ec1e6bf3018912a2b1ddcaf68a83c9d1bc6c3495 SHA-256: 5f0d2dad17008d35fd8ad6415954d83924a4ebc91d159f3ec559c5093b7dfa78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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 embedded URLs pointing to compromised websites, likely to facilitate phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a tactic to obscure the true destination or spread malicious links across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://laborke.ru/uplcv?utm_term=ejercicios+moda+media+y+mediana+datos+agrupados PDF link annotation
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/abacc52be5137ef70e99286f49c7a68d/86218710138.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/takawozefug.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4687b873---xikuxinewalemubaku.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3125e6691b---46166379595.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/45071031126.pdfIn PDF document text
    • http://xinyuemu.net/assets/202107/files/20210702230537899529.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/39606732754.pdfIn PDF document text
    • http://centronegozi.com/public/rivavuvisuko.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04a23bc10d---86739880778.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/73749348559.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e7ccd9477---62675339537.pdfIn PDF document text
    • http://samtle.net/ckupload/files/timoxikunawojolanoruvadoj.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/56914092619.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/nadap.pdfIn PDF document text
    • https://laser123.com/geektic/files/femopebulaxuberozuke.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/00775b26bbb762f94165d689431fa2ff/tonigedavadef.pdfIn PDF document text
    • http://fbhsclassof70.com/clients/f/f6/f6e65d48c6cf753e26882f86001d336b/File/74992553777.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8143c0580f---23694509794.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/62640204680.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/zuwovumobud.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/vilowarezukatutigi.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/94295681533.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_off0000f103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF103 11136 bytes
SHA-256: afefb10ab9b438836948eb8f14d61589b00de4d2502bdb8b1ca984b7fd6b365b
font_01_sfnt_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 17084 bytes
SHA-256: f4bbdf2b0c6367bf010931e9cedb3e597866727214bf7c3040643bc5ea513707
font_02_sfnt_off00013651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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