Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d2e0a1e6570c8e…

MALICIOUS

PDF

69.7 KB Created: 2021-10-04 03:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 26e64fa503a5551d28fc39dc5b22685b SHA-1: 1e0973fa37790ac979331cd3f5358ea35a7f63b3 SHA-256: 83d2e0a1e6570c8ea7bb637254187902a2b9b47c653063f665f53f900723cd2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and 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, lacking clear user-facing text but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161423a52a0273---61826634670.pdf In PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/48d9bfb449a46240ab1b2af8925e667b/68215500799.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/66844546684.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158e4afc080c---gezinowutuxefubagerekewa.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/49898723107.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/walomodokuzigujepal.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613011058e18d---81518883415.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/84173579150.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/96893331645.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/95554777245.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/gesefajiw.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/0bf79ad424cc66153dba1761e5e52642/45020355324.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210906140103_YmVydXJldnVwaW1ldGE=.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///bibarewisebobepo.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/vugazufepusubugi.pdfIn PDF document text
    • http://patroha.hu/file/54337864190.pdfIn PDF document text
    • https://masukpt2.com/contents/files/54373920666.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/konelisenuk.pdfIn PDF document text
    • http://dgkno.cn/upload/26733734880.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210911023332.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432a155d65c---jixadoni.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/togen.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/82868671103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=marcuse+reason+and+revolutionPDF 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_off0000b229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA40 10524 bytes
SHA-256: 824b7e941a742d5e80fc42d4385fb833c9a693125df71d5236516db01c2d609e
font_02_sfnt_off0000e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 15204 bytes
SHA-256: 52dfd9781c2145d64d33fb4bed2d01cf8600a5a63a54e45b2a6e832c49fbaf97

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