Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9278a0e6faaea45…

MALICIOUS

PDF

89.0 KB Created: 2021-08-06 07:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 809ba9b98d86380f9f50d337756234ed SHA-1: d34b959ce56b44b6b4cdff182fc93b3896931d47 SHA-256: c9278a0e6faaea4583880ce9a8d7a0a42303064d09d262115e40f5694c5fd546
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://primaneighbors.com/userimages/jezopabax.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ce76e2b79da---kaziwetirasori.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c74eafd2d96---gukopadezogefe.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/2c8e45f22723f6b4d15206086d5598b2/11463784413.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/kefonotozetopovidoliwow.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/73056323080.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d034a6ceef---58349428179.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zebakuxotozaw.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/88054405483.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/vuvovaw.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec952b52aef---30657013452.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/vikuvopamad.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/66213208486.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/subuwexizo.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/84e5822583a201f3f8ea3e42c7dc6420/29302502236.pdfIn PDF document text
    • https://istanajp2.com/contents//files/86564489245.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/qj4d74gn29obto8gvqm7b3g968/gijopomakupelafo.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/pifiw.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/60724762912.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/a1e2a99f6f92cc3e55fb88b78af71a02/futufolo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160902150c8776---gusixususitajorimikivoni.pdfIn PDF document text
    • https://schmitz.cz/res/file/sarotevudib.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/95519999342.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082714e4e0f1---76423821462.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-20/20210520103134179707.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d229cb06---tuxisavifat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=tipos+de+relaciones+humanas+en+la+familiaPDF 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_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 10852 bytes
SHA-256: 57082df48402cee9c19fb059846ccd759577aed1980bba107b9ed97e6b976945
font_01_sfnt_off00010d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 18144 bytes
SHA-256: 2e73b2cc2d0942aeb9d7438dbdd1bd3695a56cd91607c4a51c1b22d13e3c97c7
font_02_sfnt_off00013b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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