Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7537c675480e86…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 20:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5cf62ec97018709d1733bdaf66212658 SHA-1: 5c47e205e1a75629b9a6107ae1d03bcb7bbd461d SHA-256: ab7537c675480e8663a0cbac88c66c38ac590dbe09ef691977e69e4ab4531e39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The 'SE_INVOICE_LURE' heuristic suggests a phishing pretext. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents used to distribute further payloads or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kirakuramenandsushi.com/uploads/files/wipasivewiwatemizigeno.pdf In PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607a906ba4f6f---kilugeridutimijubemuzope.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28093307779.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/gubiner.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/17274af24e04a5ff44639805c623b705/baxijumogewapikelogonuvu.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/nemesizafidorokurixek.pdfIn PDF document text
    • https://codecs.roimages/file/xexunulavagaxawujufa.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161010a29670a0---57381987930.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/pawevizuxulami.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/nikevifo.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/jepuxavuvotubenaferaru.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/mepepiter.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb91d904615---84235486313.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/nmfhtmeakvi8rhg2mf7fhhsgn2/44182051308.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/cscso5guqsmbn1s4k5980jc8as/xosabegaf.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/tagitegewevaku.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071e9afd2eda---31481648315.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/nalodol.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/54388572713.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b4b69ee9b---80904169889.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/13141727071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=adoptive+rite+ritual+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_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 19872 bytes
SHA-256: e83eb04908bda7ced1f31ef84ed17ca78abfb44990e26a81df977a91e2531991
font_02_sfnt_off00012e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5D 10364 bytes
SHA-256: ca20d8a09f4e903e60556a659f716c08ced473dda4cbbe06ed35d7e37515ca7e