Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb35e96bb6590ef5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 02:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0db530e4d9cd496cbc31cd586e8e4b56 SHA-1: 2e4862c830f13359916dc6133474ebd3f788cb12 SHA-256: cb35e96bb6590ef575010394d8ec2a0878f35a1bbb7daabb8248c0370873c774
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected 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 CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of deceptive linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pivotal-technologies.com/userfiles/file/25308558359.pdf In PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26223644b---narimebovoxujagudulebili.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/3225920584.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/51bb091a2458fa2e3e0b7421d6045a07/sukajijaletu.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/savolokenelorozuxu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e22953e3c---vutakidita.pdfIn PDF document text
    • http://iwishop.hu/file/39154847573.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kulex.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160892b1e3962b---13341831308.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/64595026990.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc068b01aab---33621966629.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf788421d4c---58426825102.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/xifapoxed.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/14457281152.pdfIn PDF document text
    • https://herfection.tw/upload/ckfinder_temp/files/20210626115048.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/e841f6e60577a1f5ae42f0c491f76bf7/15555215994.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/fimomimuboxijes.pdfIn PDF document text
    • https://artenika.pl/fck/file/85059658371.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/12757206650.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079765e28a70---donokufokodujozeburev.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/60148149399.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/tewur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=%C3%B6vers%C3%A4tt+engelska+till+svenska+pdfPDF 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_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 11092 bytes
SHA-256: 0733de8c84f971325972cd7c93492d20fc1586eacd8e9f66ae1bcf3c22cfe29c
font_01_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10943 18040 bytes
SHA-256: 583ca2bce2be61a92762fa20b82e1622a1a42d7de81916aba077ea64d5cee807

Open this report in the interactive analyzer, or submit your own file for analysis.