Malicious PDF — malware analysis report

Static analysis result for SHA-256 7041a8d585ab518c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 02:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82bc07c8905d62ffceb9e52d6c0f6152 SHA-1: 72c9ca03f2546b093d14113dc4538f82fbc5005b SHA-256: 7041a8d585ab518c72b10edc61efb6c64156852e70a02e3408de7a9dd2292cde
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and other disposable hosting domains, likely to facilitate phishing or malware distribution. The presence of a 'download button' lure further supports a social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://krisoc.ru/uplcv?utm_term=vivah+full+movie+download+720p+bluray PDF link annotation
    • http://zentrumok.com/userfile/files/pimamobedobukolizafux.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4p4csu97ctg1fe7ocn83ja0oo2/vejuxibeforijejeradumaro.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/taq9trg7feajbdlci0jlr6vj1u/47480351194.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145061730ac2---35503802407.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3cc018c1e66d9f96ce0ddb76f06babe5/niwinibekevopuv.pdfIn PDF document text
    • http://hijoin.hu/editor_up/mufijupozakotufazok.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9981161457.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/93607135582.pdfIn PDF document text
    • https://cartolmania.it/file/kimetuf.pdfIn PDF document text
    • http://mobitransjogja.com/files/54824056200.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/79kt2082tqihffii9bmlsuqgah/tenamitifuzugapelisus.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/21634968561.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141de269eceb---27158714998.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/52844206457.pdfIn PDF document text
    • http://vina2002.com/uploads/files/jawav.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/poxetetupa.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/14101674918.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/98570244177.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/88856388954.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/fiwevared.pdfIn PDF document text
    • 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_off0000dc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC34 17224 bytes
SHA-256: deee7bcbef6bb0cc034964f31263842b369db257a33f5bec074aac0a83df09f4
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 11264 bytes
SHA-256: 24aa14675ebce3781a886365a4dca485e05a796619f1d50e20e1598ddfaa7f02

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