Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff27a639a54ac63…

MALICIOUS

PDF

180.8 KB Created: 2021-07-21 05:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e668798272a69ed8f4ae01d2d644e79 SHA-1: 5bfe98ec6e5a4be1d1670271cb5a1c4a2fdc350c SHA-256: 6ff27a639a54ac63294fe50d91292a68c426e7c50c99a74c4732e488d0655449
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8882

Heuristics 6

  • 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.
  • 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://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/bogurevage.pdf In PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/42054158582.pdfIn PDF document text
    • http://ibb-online.ru/f/file/juviw.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/501a3d0a4e5a80836b7523c2ea1474b5/rojaxejudapakos.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/15639420334.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/u3cipg4vp6oodgl6jfj2l23n4s/degumobite.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/91714524144.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b2f5bb5e6e87debaed1393aeba6ed4cb/gosowarumisibalozosu.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/puxadidebedubunapug.pdfIn PDF document text
    • http://tms-operation.com/upload/files/risedenogema.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/53721322872.pdfIn PDF document text
    • https://x-software.cz/data/file/sakiniguromago.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/fatidekuludijoxodubuzagal.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/dofipelagepovesajese.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/9f84cb2e6bf7223d651813509f894834/nusokejeniga.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa949696c15---66718691827.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/3684163ea6ce95253790b91a3e948ab9/83515145695.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/29698823951.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160871ee7139b5---pepoxaxotujufijemitu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/mu1trkdfe1tr11vo4266pjt9g9/51817845131.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/jururudelulaz.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/8faac029dff65c5bf51300018c32c4ac/kesowotogawilu.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c4cd098ae6f474e19c1cab7a1908c575/23101849519.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/b8d59704c0703100d32e5c476cbdf619/19245191478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=well+bred+courteousPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00027f6b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x27F6B 35896 bytes
SHA-256: b73d4130a87ae72bcbd4a9f9c0f45333a7626e7f502b4f06129a690c893b96bd
font_00_sfnt_off00018ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6DF 39388 bytes
SHA-256: 301fa4bbf9a53a6fb0306848bc01ba897ccef10ac98af3e07643c5acc3f6a2bc
font_02_sfnt_off0001f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9B1 10236 bytes
SHA-256: 9da1d862e7ae8205a1eac384ff694cac0d95672ea99efec7e30af3bdb55c96b0
font_03_sfnt_off000210d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x210D0 40624 bytes
SHA-256: c73c539839b4611581a70975124b817aa816058b35373a92422c93bba24e0424

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