Malicious PDF — malware analysis report

Static analysis result for SHA-256 19de781e13308429…

MALICIOUS

PDF

92.2 KB Created: 2021-07-01 10:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03163687e41315d71aa04b0f8e535d29 SHA-1: 09a98677ad734a3fac3287b3f4517bb5c120dd38 SHA-256: 19de781e133084297baf2020e98c85f1e91ff54838cb540f4797d68b3e575c64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/uplcv?utm_term=the+oxford+handbook+of+food+history+pdf PDF link annotation
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/jon6btrrsbepll7kererhfp7ot/gateledakinuxedatu.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/bb0382a0d7ee8053d20bc68ea079129e/40574170414.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/fd36217c2e2caa96f23415c17373149e/54520667833.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/laziredunekisatipuwuj.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a2334ea6---fipafiluwenek.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/0300f00d6493b1e9073dc6dce2f643a9/pavoramom.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/b9bpok62cro6pb0n3p1i4p2ht5/67048322480.pdfIn PDF document text
    • https://estoniapools.com/contents//files/89940999255.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4f96e5486---temimemot.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/nc4r3kp3hsi69ms327plns9f07/25376678216.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3vhdmk40bdkfrdum868jp41com/zekikuvulosimazupirekuzup.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095a76eab64d---95403291055.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/dewub.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/42470516978.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/34ad02bcd247143e951b22314d17453e/woraxumevusig.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/zaruxefewalimov.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/24342923615.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920c3ec0fc9---bibidepigitul.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160be4770065b5---35791885954.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/nuxofodivotimalewijugib.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_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 10960 bytes
SHA-256: eeff1d3ba37a85132363c926e956684dba81dc90edb0d8d3264269fe1abbc6a8
font_01_sfnt_off00011d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001355b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355B 17848 bytes
SHA-256: b39a7958ec6dd8c6ed52b592c87eb9457fa837248e7dfc598dee8229ad002f63

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