Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ebf2cbf39e789e…

MALICIOUS

PDF

76.6 KB Created: 2021-09-08 08:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf4255fa09952ac9deabcb2463a189eb SHA-1: 4877b7bbbbe8034272c7165ddaf7bd5b8793a588 SHA-256: b3ebf2cbf39e789edbec194ec1c88d737dc4cc0aa5ecf94d190922c06bf48169
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting, suggesting it functions as a lure to external malicious sites. The presence of a link farm and SEO-related heuristics further supports its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=linear+equations+worksheet+for+grade+7 PDF link annotation
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210707093151.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/labaweresojomoxadug.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/e1e12ea906dea234f496d6f4d95d1fb2/toremijulagek.pdfIn PDF document text
    • http://vce34.ru/attachments/file/sedupikijetekowurevutobal.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa7bd382a---22739620853.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/6853546952.pdfIn PDF document text
    • http://furniture83.com/upload/files/rixadudirikiwujutasodew.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/kadutovetolanojifubum.pdfIn PDF document text
    • http://ippon.lv/uploads/File/rawad.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210623184836.pdfIn PDF document text
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/vaxolivaxaze.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/d067e2e82416b716d434ad96fe6b1d5c/bepomi.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607da131a2d74---mebamarot.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e5782991087---58615003212.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/25058096284.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5b11eb0c0ce09ab455bdb67d5ee52c61/sumujevenanujozexire.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/63364118580.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/tuxolijijujumodavip.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/95800186024.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/80971324830.pdfIn PDF document text
    • http://flexa.cz/docs/file/10605945397.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_off0000c56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56E 17780 bytes
SHA-256: ff6002c7aea3a56dfb557214282f34cc621b2204b0003fbef5765cdbf46e28d4
font_01_sfnt_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7E 11020 bytes
SHA-256: f69841220d3b53a7c6f3ca4dfcdd978bff362d47f9b0b0653c218bca488ac8aa

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