Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0328d33304444c…

MALICIOUS

PDF

78.5 KB Created: 2021-09-12 05:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6d048c345280a9d4ea5762c2db4c14d SHA-1: 499455b1d450576d9d22f9963d3c99ebb8aee61d SHA-256: be0328d33304444cc1368bd5befc90d822515f1a79ecb9965184bbfaffbdbe5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://autohausnschmidt.de/userfiles/file/69873453671.pdf In PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613669f2730d5---39170693040.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/rerarebemodaviratosiwawa.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7272962ba---28362815027.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bb0a532a3---14479319078.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/fomolejawejusidi.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/gesolupesubokisijonibejug.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/32733075459.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/dumefirujumupakija.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/86801157173.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391429e989b---zuzenogilibu.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/kewafilupawu.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/51516386839.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/92679567053.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/dudupuzum.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/12867072202.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/13092142614.pdfIn PDF document text
    • http://atrsara.ir/resource/files/99961025239.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/45125449971.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323f423efd6---64365260397.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/wofedokabadofomiginowuras.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/72741852761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=recyclerview+item+click+listener+android+examplePDF 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_off0000cb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB25 17216 bytes
SHA-256: 7c6a2f095cac7816ab1e296cb19ddf27c66c285772a4843c1ca9b4c589e9af01
font_01_sfnt_off0000f819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF819 11180 bytes
SHA-256: 3d03a9751460e05a39154a6b0e41b002f0a66de6ddcf52cb7315f5a99f34a2af
font_02_sfnt_off00011252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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