Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b0a2d0ca5f4f0e…

MALICIOUS

PDF

84.2 KB Created: 2021-07-21 07:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4f2a2846b551e6df6131fbf3f471ec12 SHA-1: 4e833df11ab6d7b63db57e7df45c4cd5babd7121 SHA-256: e9b0a2d0ca5f4f0e91c9751b949edb38fab9d9acf729b37c245622cdfe197f02
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The file's structure and URL patterns suggest it's designed to leverage vulnerable CMS installations for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/a54d6e68caa73e705d5d91be93c91162/85216341533.pdf In PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d2bd3dcd4---75520726692.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/zovidefikelimomovuman.pdfIn PDF document text
    • https://afayl.com/userfiles/file/37446610454.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f84c01932d---lipuvepeteraw.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pabunapuziwepitofubeko.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c76e91617f6---99142223821.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/xawerinoxivogora.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074ffc2d7468---borujumorigijovaseve.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd69749368---lijalujadivugunagawiluw.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/vefavuzit.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/cfea15d6eea15c9f530249d740f25f1a/kexexejegepasowe.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/18350663646.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/l8qrdbjheab7ml1kgd6dtradf0/toroz.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b81891b7ca6---nikapuzuf.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/julufafoti.pdfIn PDF document text
    • http://hasyo.net/files/file/11308952296.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/14568989193.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5320068ef8---77686589344.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/61716447391.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/bukova.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/zezizijorelupuwogopop.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072e484a40ec---bopagedenurekesuvize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=can+wool+be+dry+cleanedPDF link annotation
    • 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_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 10376 bytes
SHA-256: 8663a6a68408aeb14a331aab5f16c4d40dd16c125020bcb6dbd75b8bd878d6e4
font_01_sfnt_off000101b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B7 16388 bytes
SHA-256: cc5bc8a3d126d6ec9a64f0e8ae35201bc575fec09bfb3d72aed3864f4bbb1d72
font_02_sfnt_off00012bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1