Malicious PDF — malware analysis report

Static analysis result for SHA-256 6089dff72962940c…

MALICIOUS

PDF

95.8 KB Created: 2021-07-01 23:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7f2fd066e4bc0a74df1a87ec6d20e07 SHA-1: 66c6efb4588ba57ee1d45d311060d3adce85cac5 SHA-256: 6089dff72962940c68f332e5e97c28aae3bbfe63e7710e89b3c51284a941cbd9
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 contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://shibbirs.com/media/files/65778360437.pdf In PDF document text
    • http://malbreil.com/userfiles/file/zijesorijonirutusatoku.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/929dc3d034bb3a8d56cff0913f3f3881/fefibomipomuregubadaba.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089681b892c7---fimovuki.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/37470353519.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbace40b8c6---tokemawenanudarawa.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/accd8afce14bcd9e79745b5d3bb00225/tazode.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092c1f05d980---wowufugobojuvut.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c63a80f18fc---15649060397.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///26074693800.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/xadoworakoluzudozij.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/dumamamujumune.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/68297095695.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/261b141a1a55a3ad46d3b4c58c2b8b0d/xenerajinafaw.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/ronexukonapenogamek.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc61a26dbd3---gawuniganesasomefepopoxom.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/kitadigit.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dfc5f1991---54076374075.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/20cef12883d65f5d4de669dde5fef216/suxago.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160cacb363ac7b---34142864939.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb26b8e039---vonututomufamo.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d9ef69f87f532776e67695af449fc6e9/78248114142.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/7d5bc39cd88e1efc105d3ad97844b262/rerizamemezu.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/xamulujawupesodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=domain+specific+languages+martin+fowler+pdf+downloadPDF 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_off0001121e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 17228 bytes
SHA-256: c3b4b224db2c14704a0a82f2f0d5127530f8bb01b3bf23bdb0fb6476725ed90e
font_01_sfnt_off00013f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15767 11152 bytes
SHA-256: b1ab39122a70a34df9a4ba97b1b29226cf79c665b194826758acf08498f81e6e