Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a578770bd8927d…

MALICIOUS

PDF

113.0 KB Created: 2021-06-30 10:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 4dd088d6b2d6efc0224815d11eee3c69 SHA-1: bdabc13e5a6a780ff7c49d3c7e726e8ff2ecd524 SHA-256: b1a578770bd8927dca15f26d5e8f0ecdabc98f7afd924acd4342f78ba1d89eb3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b0dc7ede---jadalojirirapig.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/okljbtjdqlasv9c2eota35fj6u/44494559266.pdfIn PDF document text
    • http://planetamama.ru/files/file/69032187965.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/50578518114.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/webabilusojenolo.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608195749a98b---vakape.pdfIn PDF document text
    • http://alltechsro.cz/files/nedatalanobife.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/kofowevasezixeb.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/28709880786.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1432de50885773750af5bb6cd2bf41c3/fitejadokire.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f4a03892862185d523a9d0d7c9f2481c/remijaxodivixomapepuvep.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088246548042---59816967667.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/didagerexorowiriporuto.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d5a0fed1---63840403476.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/bacpjpfhl99u2n2vfqviqpo8g0/tuxezurodugajiz.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/624032863.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/af5ac5f78c1d3264dd4dc524690cb07a/bexogusokuk.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0aa427f8---95057926350.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc401ad00d---99848666232.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/834705869.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/takesupuzopavibanaseroz.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55d1e80aa---xoviwabovumudat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=adages+and+their+meaningPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/bolap.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_off000159f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F0 10512 bytes
SHA-256: fbf1e323132400e5e2601949ab4a6df912b5db09ced72b46dbf71d21ef15766b
font_01_sfnt_off00017172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17172 17236 bytes
SHA-256: 0fd35d5197dbe11be4a38a625208ca9c148cf1e12ad81718f9d0e807e44947c0
font_02_sfnt_off00019e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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