Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa30899eb47666d…

MALICIOUS

PDF

93.4 KB Created: 2021-09-02 17:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5921fa1d4645a13d69552d78e44a3b2f SHA-1: f60d46f56350a13771aa87b01dc7c19129c26203 SHA-256: cfa30899eb47666de87b669edf30487fda92e8f34c8e3f4d7e0a236cf27db5a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious sites. No scripts were extracted, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

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 http://marinda.ru/pics/images/file/22134526112.pdf In PDF document text
    • https://inverpalmas.com/aym_image/files/42652494988.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94882203957.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/tjcp0cef9fdtsq03msf4tl0ih3/vepoz.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/nomujewubolagiduw.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/fevesufimufulu.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/vatirepebanabab.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b107dbc06e---kerubug.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/44703636490.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef7e84533---risifinanewejeropowuw.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a39d85c8---rakajirenipunozavitu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a961fcd0b24---82862814525.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/49466076078.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/47ac3a4b42783474de25b4f3feeacd7a/jesidubuzaxiju.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/rg085866su1kg7nmknu2g1csj1/3040846460.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/36405127656.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf9a16a04---gotigun.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a12e5e0f3a0373e1ab6b56e3a71d9fbd/40504180789.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/nomanenovuteg.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/kabixamovesebonemaxali.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210610_ADCD70B2DF405E0A.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/63373017756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dictados+6+primaria+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_off000105ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 19832 bytes
SHA-256: 0e9cfb85100bab92eaec8e7a1eeb1866d897ee745ec695c8f400422bd8f3316c
font_02_sfnt_off0001503e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1503E 10668 bytes
SHA-256: 66e84be44f84172058b1935440177059253e948aa93838e052deea179bbba8cd