Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d42ab3f9ec174cd…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 18:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68938bf182853b71ffb32b416110be62 SHA-1: 6c62c4d0fe943b170e825b5cab315652baefe1d9 SHA-256: 9d42ab3f9ec174cdef5a4df2876ade0c7c6d83d60790f6cfe2cecee501e9d7e3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/8eg5gcgks1gnmba5d27fd8oir1/83213463456.pdf In PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/20ct5f9abempj2br9q5iqu5b8o/68295205656.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/donovaseme.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c763c8da67---16563898541.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/37200580583.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/ac6859ac9bb4810492b59c4295af10d2/nowikipovezapoparazonopa.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/mifexok.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/zixivekimozapekajipisig.pdfIn PDF document text
    • http://www.heksan.com.pl/file/rofubifidometexi.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/muleletexipurabiwip.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b7237328c64---powagilemobutesofa.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/fanebof.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/54065657448.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/buduzigitabutorujowupoda.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/39946018108.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/pilusadex.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/padumobat.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/89666726816.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6218b4f817590173dfe40589e47dee38/larevuludegoxiribufa.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/tarinij.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba68f01fa90---18358706700.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/xepamari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=grammar+exercises+present+simple+pdfPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/purip.pdfIn PDF document text
    • 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_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 18316 bytes
SHA-256: 0abef154d2a6384682f53aca50e4e9e8ebb7e679477d6e6a42f56282feed6872
font_01_sfnt_off0001103f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 10800 bytes
SHA-256: bfd0ad7ae67c756941cf1ee09d466fac0b15d6647625a0c942ec65f35f05d7e0
font_02_sfnt_off00012929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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