Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1b84935e38be8c…

MALICIOUS

PDF

76.6 KB Created: 2021-09-08 18:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df6f914d4e6e92db53cfc7513705dcdd SHA-1: c4132743645d4c90f2a1c1ddb88bb697be967a50 SHA-256: 8b1b84935e38be8ce2fc38c36881bebdf4dd171976823b8e4d810d2d6400f692
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://studioarchoggianiepartners.it/userfiles/files/80942926841.pdf In PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/34653593326.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210908154634_1439924160.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/25568059011.pdfIn PDF document text
    • http://viorina-deko.com/images/file/mipes.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/49789719202.pdfIn PDF document text
    • http://levotst.com/uploads/files/17482097942.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/xazizewi.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/22587548269.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed4a516980---sinuzelur.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/7986338258.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/25242342245.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/kemidisuvotoneberujujej.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/46002619181.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/xuwufekalorozixexiz.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/kubofa.pdfIn PDF document text
    • http://uhorder.com/upload/files/70765586090.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/juvosagekitatorubitujole.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/305b5df372ac25f06351ca155119224b/zujalolidogogaguguku.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/fiduvuzejisezezesanejigu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9089fa8bc0c8fad90d581cfd759aee03/2007671341.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/ripopobagamulipu.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090675420_702731060.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2c1d32a4f890558e68be986f954cb4b3/wupukinozojopuvori.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/jiguwomulujoburenenepasur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=midpoints+of+a+triangle+worksheetPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210907/16309843781178.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_off0000c70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70C 16880 bytes
SHA-256: d022ebb4dd14445e91c2f7f8147b9d006d0776496b7c5d380a17b0f0892c7326
font_01_sfnt_off0000f305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1C 10948 bytes
SHA-256: ff6fad54e76ae6e2c60373b4f70958ba6f264d87eb2a8eb12901447a8871db18

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