Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42f3bde3e1170b0…

MALICIOUS

PDF

88.7 KB Created: 2021-08-03 13:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e71ab970fd35697bb6b76d93252013f SHA-1: a6ea02278cdc5f25fcca8ef0a01c355a893c2075 SHA-256: f42f3bde3e1170b0243734812cd62187542457bc58fecd6222242c5b84836e51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The presence of an embedded JavaScript stream suggests potential for further malicious activity, such as downloading additional payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9743

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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: PDFException. 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://sambometal.com/dataroom/file/bivirenuzafuzivu.pdf In PDF document text
    • http://verynailscm.com/user_img/file/mazoropupisusoxi.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/329416276.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/89792074428.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/91762928251.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/tvia30sujti1fgtovlajmoj13r/zasupilopigigupunuleba.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160e67d5351e03---xisijawopamoba.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/5fd5e8a47229f41983ab864fb0b8d48a/lutuvakelun.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/fugefelawo.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-4/20210604101129372729.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7116c21e2---lafidudupanexubof.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/od2oinarpcvm05kh1hs6pcq3l1/30813241509.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608794f4c2d3d---93625054809.pdfIn PDF document text
    • https://airbays.com/userfiles/file/27513226733.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/in6ibjqric37r6lfk101eilibk/73576030128.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/4e9c8512d9595c6e68b70acfe5fb84e8/16890684856.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/73549490112.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/22462902310.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f165b6dd82e60c1b30c98a263d4b3686/19660507529.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bba811133---fesitopizutazagilitogin.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/7cpm27iitngffpou8npgr7ne2f/23382374668.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/fgrong8avdnhth3f6khf3p72dk/gatiwedifabunoj.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/zekezekelewejeroral.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210630050757_7wm8vp.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/hbnl3688mm0biknhvr4e06t06r/71981716996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=2019+kpss+%C3%B6nlisans+matematik+sorular%C4%B1+ve+%C3%A7%C3%B6z%C3%BCmleriPDF 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_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11284 19520 bytes
SHA-256: 040258844471977c247bb8db61923c1250ee1e06b8203404353ebf48a12584e7
font_02_sfnt_off0001420e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420E 11744 bytes
SHA-256: da97fc75eba87e10568fb8c94ff16a32d440404520fe49f3de2f7cc255534510

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