Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bbdd51d6079a4a…

MALICIOUS

PDF

90.0 KB Created: 2021-09-02 02:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0562f85f6a93f099a4df77123f6937fc SHA-1: 5ae796a54ce4374f22da0a954f047f2d6aa8540c SHA-256: 19bbdd51d6079a4a947fe3f1467c54eb9a427ae68a8166a2b6a07e1e29dc271b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/56d8c4d0c06260d4f2a9c503ee50f61c/xijixekalabawiruvibude.pdf In PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/582145a90ad2b6725e8dcb384bd01fe4/xopaxubuxotekawikoxitanid.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16116d4144b693---47309182605.pdfIn PDF document text
    • https://noddy.nu/images/file/fifuseru.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610133a2f34b7---ranamujovizinizu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jdamqgvomeo3hi99rgiohtumqe/xebigepovuvejoxup.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/vitakibowamenusomamu.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/sufojozerekutibefikajovof.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/51923552336.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/renoxik.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/kuvodetotuzufesebev.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/11788238152.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/4832157675.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/vevek.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094fe14d28f2---16598613127.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/padelonewawozi.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/95045393.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/21703001421.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a04b2baa539---68480553880.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/levabogupa.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610999e684c74---76443885211.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/biporevajit.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/gevimazot.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/vazizivota.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/b70dd4f8c1566789572738ca7b677791/vizuwoxuvesu.pdfIn PDF document text
    • http://mortefile.com/archive/display/226180In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=history+of+manual+therapyPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/wufuxujobisawoburozem.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_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 10828 bytes
SHA-256: 43addbe7d4572b1db686c40074f2455b6f3a8996dfe34a97d7d2c32b4c7efa51
font_02_sfnt_off00012c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3E 17160 bytes
SHA-256: 0d3a9362b890dccc9960a348df9da30ef0779506fa33e909ab42a5a920ff85ab

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