Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf33f16fbf7203e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 23:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 975bb3b433ff1d3112e6b881f64f5da2 SHA-1: e8ebebd11ab690e0ab46d48317eda6ec29b3ea68 SHA-256: edf33f16fbf7203ebb6dc662b8a523e408c71ae49baecd5f8536d190325fe852
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm hosted on compromised CMS upload directories. The embedded URLs likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or divulging sensitive information. No scripts were extracted, but the structure suggests a phishing or malware distribution attempt.

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 https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161355fa4ddf15---2577740425.pdf In PDF document text
    • http://amoy-art.com/Upload/file/nebuwoteduzakufa.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/fonomufojisoga.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/dewevolitotus.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/90960785260.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/87003143015.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/zeleromaloxugalimunofozu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613477dc788f3---66730854941.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/tapibifivogizo.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/34074217292.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210909_508E9C209AABC08C.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f87e72a1b---xirutugibeku.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/48743197372.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/xebelobuduteb.pdfIn PDF document text
    • http://keitbg.com/images/files/653833449.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161407a59e8137---71326114079.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/gasetawasoxadux.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/6311520613.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/30244221137.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/junidejulijusazaf.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/xokalamebutorejibises.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/18481132076137b8c09739e.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109140700471473.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384f1488f88---27939708922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=edit+mp3+info+androidPDF 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_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 19260 bytes
SHA-256: 6c987fded564a9ed153ab7e2195717ca9d8c4b78732d6863837a801612a2e0ae
font_02_sfnt_off000127a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A5 10468 bytes
SHA-256: 913669c8da4fbf2e7f2ed43c35eadb15040118bafba9a8f14b3436764ee7b2f4

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