Malicious PDF — malware analysis report

Static analysis result for SHA-256 0015a34c06428b26…

MALICIOUS

PDF

72.7 KB Created: 2021-09-04 05:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1b7f2ddf2b3e25e0c23d9fd07e80a06b SHA-1: 39be295a4ece806c3518d3a8c658864f8e983ed2 SHA-256: 0015a34c06428b26d6430a655cf0a516fb29a0efff647e984c8de80e6e9783ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress upload storage. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to one of the numerous listed URLs, many of which are hosted on compromised sites. These URLs are designed to appear legitimate but likely serve as landing pages for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.sesc-am.com.br/Selecao/ckfinder/files/63564352192.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608be1a64d234---36114079381.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/paqocsvu6249jsrqfsvm13e0eo/61617575161.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/cd1b9f9b12fab088e4b9a58220e2d4a8/kikuwurow.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/10352633407.pdfIn PDF document text
    • http://poorclarescork.ie/images/24456266790.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/25432184117.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/38171063503.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/tilazunupigomoz.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72fc97699e---xinulijotiz.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/labepa.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/tasewanonenepadarefinome.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/26540178057.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/dqghauj1lugqctvdf3eitvq1g0/68739798655.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/kozeb.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/r0g57sn9khtafq61set4lgs84c/62917385980.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/28807766638.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/aa8b808abc2eb5547ead685301c15f1a/sigajojefugifuk.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/jrdsp7gpfqnjsqromovjki4sju/73840455318.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/dafimonolinesokajoxe.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/kawabugafexiwepu.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/k0k14qg1574cq7gm1nht3k8nfs/wovorogelapurisegemel.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20218211219277540.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e269abe36401834421d1741c93f17135/275928297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dise%C3%B1o+hormigon+armado+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_off0000bb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD328 11008 bytes
SHA-256: 0b37be2efee8dc7e2b56d21ed2792a06b6f5fb4083d14e9a622bed26dacffc0f
font_02_sfnt_off0000ec09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC09 15768 bytes
SHA-256: 295fffb3db0568bd91d538f9934d05b0fe884f53e933328cd9096acfddc8755d

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