Malicious PDF — malware analysis report

Static analysis result for SHA-256 599fb43fd5fe4797…

MALICIOUS

PDF

108.4 KB Created: 2021-06-28 19:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f121ee0c3f4a16aafc51425dacd2424 SHA-1: f6ead956607409257ff9afd8e2f5929ca1c76e9c SHA-256: 599fb43fd5fe4797a568502c21bef09e2ccd0470711f76a9da43ff5c8548a6c2
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16824198c2---33248669287.pdf
    • http://guinyardfamilyreunion.com/clients/62985/File/1682594946.pdf
    • http://tortsurprise.ru/upload/redactor/files/lewazukefuzusesetogodis.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17bdc64936---69579002158.pdf
    • http://tuclubcr.com/campannas/file/19039724855.pdf
    • https://clumba-indoor.ru/files/files/totavusiwefimuzejalokidin.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6acaaf233---zuridixamutelo.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609653675ee64---nopekede.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/642b3540666f6752bfb454f93e05e21a/99043776695.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/3b3db5de40199ab2e82ddf1cb8dc9cec/29111970844.pdf
    • https://akapacha.com/userfiles/file/18905186356.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc60c7c1bd---24172472728.pdf
    • http://georgekoldun.com/var/upload/file/jukutopudupixonuta.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d1963453e---53016394942.pdf
    • http://graciaindoutama.com/kingkong/userfiles/files/13021595451.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/10c141f123861a3f667313a405d33782/gegifiperudinafalenuzun.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/76e3af32f3362491239826ee19012743/sefukupuvat.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd99cbe78d---nelifotodiz.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5e7d071e---jilarenifiwosereratezoma.pdf
    • http://utuin.net/files/fckeditor/file/vojuli.pdf
    • http://lookkorea.net/userfiles/file/jezoberuxima.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbf54661d2---28694770750.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f9db3c003---putisijid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=torque+equation+in+induction+motor
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014371.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14371 16792 bytes
font_01_sfnt_off00015b88.bin
d20f3cf2516cea28b7fbb61112702f2ea2e3485c6d956c3eb02350e63592246c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B88 10524 bytes
font_02_sfnt_off00017339.bin
9f35a576819cb97f6de8a99acfcf94b64c7435e61e55c12b9f00c294c801b96e
pdf-font-stream PDF embedded font (sfnt) at offset 0x17339 18324 bytes