Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb42720f5243e03…

MALICIOUS

PDF

68.7 KB Created: 2021-10-02 11:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9c8183d12678ab0cf068653f79d80f5b SHA-1: 1bf6dae2b40ce096583eca091c7e7e9bec7ed8ed SHA-256: fbb42720f5243e03bb33c8680a5553bb1b92fd5170fa43915dfcb56c9ec76912
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Embedded JavaScript streams are also present, suggesting potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/357168e09308f3f09002a09bfe23721a/lobikebexas.pdf In PDF document text
    • https://nawaasha.org/userfiles/file/biwuwedujepugewijufu.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2e1f966f8b145bd85b001630b5806494/4262646881.pdfIn PDF document text
    • http://stl-hk.net/userfiles/jezovolifuze.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/18844151294.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/gugonepigotiwefupajop.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/1577676122.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/81236841828.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/95119609600.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/kilakobufowufitufidijiv.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/66394382220.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/sozekekigovamubikolosut1631488644.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a5ca01d245c3f59f724023aed9a062df/kobik.pdfIn PDF document text
    • http://shinhwacar.com/userData/board/file/60423753795.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/91954901108.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1dd4d0ccb---tirew.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/wifutiduzisojifokavefumo.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/gamizu.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/11642686530.pdfIn PDF document text
    • https://teamcode.net/upload/files/vovelobu.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/gekedituj.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/rofenekeketutawixej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=types+of+itchy+skinPDF 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_off0000b041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC853 14804 bytes
SHA-256: 139cf8604e41edf977bf020716547a078f00b8f8ba4d6e8f97dc884b76c37544
font_02_sfnt_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 10436 bytes
SHA-256: 79159da5e96058aeb75a7cf50c415794db0676d6e03715e9452d3a1fae3dbcba