Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61e1fcdc63f78ce…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 22:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 86deeed51681eb2bb7d016b01a91e48c SHA-1: 07892b95efff8ade1cafabb029cf5c8cc1f94040 SHA-256: b61e1fcdc63f78ce78b42fe5bce4a392b1ddf2798b52a6225978f577b05fca98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs pointing to link farms hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ritadas.in/userfiles/file/76781030423.pdf In PDF document text
    • https://nedimgame.com/calisma2/files/uploads/68452113433.pdfIn PDF document text
    • http://dasbluemchen.com/96748470709.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ff4e12a24cf70f7be5877f88c63cca52/430971345.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9402736d3---tiboz.pdfIn PDF document text
    • https://scalping.ir/data/files/file/78443434250.pdfIn PDF document text
    • http://lukinserv.hu/file/14411090881.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/884393646.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/migibugujerunodoxin.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/16424073578.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/lozixun.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/vojiboropizodoruvigemo.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/bopesolebupobozisorop.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/vojixevukoxa.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613642e7c5627---73672630656.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/zurokuxumarogikojetataliv.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109010458046194.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210906162113_d602bt.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/11152191566.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/12984409875.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/verokugurelafag.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/89628740021.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/muxefofutotozosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+ben+10+gba+rom+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_off0000be4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 10724 bytes
SHA-256: 394a3d0dde14e5bf6c425e6713afd01486c27220d9d4b7538c34c39f4f4c9ccb
font_02_sfnt_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 17632 bytes
SHA-256: 5b9a998c6683229bf65fdf4a4b1ee977ece1c7eb73093b862e8f0940ca5e81e6