Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0def4a7f1a42db…

MALICIOUS

PDF

96.5 KB Created: 2021-06-30 14:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 51b0d0b18be78ebb6ee4ef1cdf8ab8ae SHA-1: dbd2eadd997baae407827878fd1d557b4c189e8e SHA-256: 7f0def4a7f1a42dbe3ba60dfb0cf75b0041947192455b12cccf6235b861cdf4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions. The numerous external URIs, many pointing to compromised WordPress sites, suggest a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://inwebjor.ru/uplcv?utm_term=philosophy+for+everyone+pdf PDF link annotation
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f61568e71f22c97b0d18933ff8509ec7/93205841320.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6f8cd5be70da0437322aba709e748c1/80588274734.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/jgvq1v8s4jjfcpp99r0jcscfmq/71161295483.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lupj2423lg836icqskkffek6ob/pemifi.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5db35da6175fbee49a8903c32e63250c/rawitazetoviporelo.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///75479562281.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/99c2fac8f22063a4e01ded46f5a41572/57891933697.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d834af81c---76231893536.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/70593029727.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1589e5241e6546e71dceb8745551b788/gejajejugifonipotilojavem.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/15067418844.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/subuk.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/jobam.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160819138677f3---12752873195.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/qlvl9h749krkisupnb5dcrebl3/56223074596.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/fizunawevelagelomuk.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/da32748e39d655a27da066fa320e8f1f/gifobo.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/9a98970a46a1b1bf570266f42a310765/jikowojuduser.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160abde90ddb9b---dexewanogurorokafiman.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_off000116c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED2 19000 bytes
SHA-256: ae81c986e0747014a17cb185fb42111b33b8097f1a2ae87207360d3e231dfc9d
font_02_sfnt_off00015d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D79 10516 bytes
SHA-256: 456d03d76732c87210e8ecf4238e01264b1dd21a1c4f4c7f3b692c4994b967f5