Malicious PDF — malware analysis report

Static analysis result for SHA-256 2213a12d193d4703…

MALICIOUS

PDF

89.5 KB Created: 2021-10-12 13:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c7aa5888237883e850aa9b6ef5da4c70 SHA-1: 913ad28c15260dd0fc740247269e86b95478bd5f SHA-256: 2213a12d193d47038ce3948682f69b7516b882d34a74e00db345603b2ef91f95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or SEO-based malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://yds-wcv.jp/free_images/files/2978110858.pdf In PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/70527063572.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/wawijimidonazed.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/notenavititixozix.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/61496563516.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/jamuxojozu.pdfIn PDF document text
    • http://epicridesnepal.com/files/20709906023.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/didobosu.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/gesime.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/12413341545.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/79797893610.pdfIn PDF document text
    • http://zimmerei-possert.at/tavisi.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/zuguzigopu.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/a467e29c5b8d11b86e28e201f3bb7385/69850401034.pdfIn PDF document text
    • https://alibaba-cave.com/userfiles/file/5880921815.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/77386304025.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/71151010984.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/987ctflqsakk7i795o9kn8u9bg/melakogorowik.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2dc44ce5098efb344495804326f3eecf/70556250836.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a686003c18---dunefenogubovexux.pdfIn PDF document text
    • https://olterus.net/contents/files/wazutev.pdfIn PDF document text
    • http://shesob.com/file/files/47522614212.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/fifitefetomeredizazi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HKUGBsJGI0E/uplcv?utm_term=croods+2+full+movie+in+english+watch+onlinePDF 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_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 11328 bytes
SHA-256: 608e9251aadc554d28cbc2224ef8aadbaee62b4a3a3e835b9055e245fdf3df8b
font_01_sfnt_off00011089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 18244 bytes
SHA-256: 3a89297618a13caaab4b21806b9768bbf7ebe48420797ac4348d4139d6097946
font_02_sfnt_off00013ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1