Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8257f8f556233a4…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 13:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 76949597fa4969f1624b4442051d3b6f SHA-1: fa9b0e9c4ff210162a40ff6e76f9aa5d21492d31 SHA-256: f8257f8f556233a4636e49aa48d42a4de99b4c9ebe8844771a3577dd74a3d837
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and other potentially malicious domains. The embedded URLs and the nature of the heuristics suggest an attempt to deliver a secondary payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c07bab8dd---jobimeb.pdf In PDF document text
    • http://studiofelician.com/userfiles/files/80899062670.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609834aacaac6---kifosejisojobedo.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/33170914377.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/lufalurozosi.pdfIn PDF document text
    • https://noddy.nu/images/file/16881978226.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/95456174416.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6aeedf87---sazunulalevajizu.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/36073067915.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/93072292985.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/74766518824.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/35869717030.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b08ce9b33b0---38067521949.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210831_6B54F338701B0948.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/jatezopi.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c89a7702d8---gewajali.pdfIn PDF document text
    • http://gesema.com/UserFiles/file/kamuxinuj.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/64386143011.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/98f7218e328cb2b105299ee73ce52a2a/gemunapomasegikol.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8167dda7be---84738562646.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf9ec5c6664c976d119f557abea16c9c/kufigimina.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/90644604652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=composite+functions+quiz+pdfPDF 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_off0000b5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE8 10808 bytes
SHA-256: a3da73e4a19cb093fd1ac9fac2b53f5eda070a901a755f30ba85fc57fa978cd8
font_02_sfnt_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 17544 bytes
SHA-256: 226e2288e35b035660155ceccb2e262a6283a8a4df67c710bc943ccdf5056e30

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