Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fd2ebadd0a301e…

MALICIOUS

PDF

79.3 KB Created: 2021-08-21 16:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 5de2dccf17edd22c88c28945242abd99 SHA-1: 4d749aa78644ecb1ccfcdefc24e3bf56fe667111 SHA-256: 05fd2ebadd0a301edf0cd38cfbc56cefcd94e9d7dfe5b37ee1a49f53244bde54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories. One such URL is http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab17678edfd---kividufemuxawu.pdf, which is likely used to host or distribute further malicious content. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9609

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://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab17678edfd---kividufemuxawu.pdf In PDF document text
    • http://podlahypilat.cz/admin/file/44046655227.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/29128091196.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/9fbd8b1cbe82265d51b331c8ce776374/jiwupipuvibe.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/tnb63badr0e4thadcm1q0g86ek/vajuxotot.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b1ec659acac290e0c2baf079d9c413c6/85320173677.pdfIn PDF document text
    • http://chinahongji.com/d/files/3476421465.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/79aa38b88fe055a49ac2cd0099bde1a9/jamumutubanubotaziz.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/5417154167.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/37477766672.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/43732303415.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/wunomapuwa.pdfIn PDF document text
    • http://healthywithhart.com/res/file/vevubomafalivanomivu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bada20a727---60015974900.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/40736263698.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/br28ejr3ibqjvn1h08ljgce66u/fufulibomila.pdfIn PDF document text
    • http://moffatcountyhighschool65.com/clients/878592/File/senarotubovofoxofimilet.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/fugozuzajefiwaxakasuwom.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/pepawojotipavajekoz.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/begojodipoduruvedam.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/sonerorofadirixiju.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160887a77ed1e4---7759000977.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/selogutafesagofidagugan.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e634e7ebf0a---rigejinamenebofudexim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dbt+mindfulness+handout+3aPDF 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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 17252 bytes
SHA-256: d337f12a513cab1368ab62ec95998a174698d20046842ef828d131c455c1a993
font_01_sfnt_off00010aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 10932 bytes
SHA-256: 21f9dec1bde3355dbcee566d9310e0099f7727e3002ab4bd61f898b9e373a14e

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