Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33f8ee13768d860…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 03:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 675d6b8137a224a468323e23bf31f158 SHA-1: 681a304f37f28a06f8970e622bd5dfd96630ff52 SHA-256: f33f8ee13768d860ee6dbfa5a1580026436c1bed2f2cc982dc56923cc14ef0b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, pointing to multiple external URLs hosted on potentially compromised WordPress sites. The presence of external URIs and link farm characteristics suggests the PDF is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103c0efb3c2d---gewuv.pdf In PDF document text
    • https://laptopserwis.com/app/webroot/media/files/xukuvikidinelufuzaziwediz.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/kunuda.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/a22k2rofm3l46g9t4lnjc0h1d2/nigotetenamobosezomojefo.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///begurawezulegaropoxemil.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/81425775410.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a90982ef---10199494696.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/ruxufebixatumefotevi.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16071c933ce724---18354490578.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ea1e8b39c7---94583641035.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/55765335410.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/799cac3dd582e16ee126f3e3ab0b5ab6/89071066128.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c17576b570---7720474297.pdfIn PDF document text
    • https://service-panev.com/userfiles/retuwanifusibizef.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e9306fbadc98f7d73194f6dc60c794e1/1811066800.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b305f598d0---95940986541.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/39900571478.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/47173073513.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed03df29d---32938795714.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/sarefuzeriridewoveko.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202107012203097890.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/1586b8f57e6ffd9c51665783e8478966/21866148157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=reduction+pdf+file+size+onlinePDF 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_off0000e1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DC 10556 bytes
SHA-256: 0bbc2aec243d581433f878c6bb293f36f8d56c7aa0aa34e93039d0d879a55c88
font_01_sfnt_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 17640 bytes
SHA-256: 2750eb7bc2acd31a3f08284f0a8ca2e6332cbb745c5dc384611864afa6979f17
font_02_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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