Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ba31527bb64c25…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 09:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7df03883a2b22687cc7d1eeff539da56 SHA-1: d1e77f8e0b80bb7b6812862737b67800bcdeccca SHA-256: f3ba31527bb64c25edfadcee511db69ac6282e8a047dda73e3eeb162a33c919e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of embedded URLs and the structure of the PDF suggest it is designed to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8058

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
  • 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 https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f4c5338f48979e2ee8ad45012568ddd7/metosuwupo.pdf In PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/a1df062c5c23148283011b02c39fa5aa/taxikijasezanog.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/5f8ljmn2okjofn3c1oc9so1bn7/mazogodunuwi.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9aaf8b3cc1---lidopijujurumulevimu.pdfIn PDF document text
    • http://bronia.org/userfiles/file/47700075758.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/58684204968.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/nugegusibazesizo.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/5bbb0aaa4c6918f01c7bf6165a236348/toweletegoj.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/48431379379.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/6a16337ec69ba78fa45dba972187990c/dizibofegogejo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097aff635af2---bixamateferusonijurefujos.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/jiwup.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/jutosimuradeb.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/4645953567.pdfIn PDF document text
    • http://starsunited.at/upload/files/wikaduraludot.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/pekotokijazolosado.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/67169267907.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/860adbccabf33b70e96f33b3342c38f7/69323905776.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/95329475134.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c636a763439c07e537341ba835940c73/36067350854.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e37aa83f4cd---pebumowiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=closer+chords+bethel+pdfPDF 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_off0000c59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 10528 bytes
SHA-256: 869c0db6668f18662b63c87e63ebdddef8853c37878220da24b05936984d4d0d
font_02_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 17768 bytes
SHA-256: 5b99bc030ba36b979623b8bd3f7629718bbd6470875f859491073171294e372a