Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed759a0a047ee53…

MALICIOUS

PDF

112.9 KB Created: 2021-06-28 22:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 568e2454add54ff920933dd2f350b08d SHA-1: de9bfbba515df840181eee81534e669c11bb181a SHA-256: 1ed759a0a047ee53f97d3853a91bc7c74aa7e52ab1a3bf5d34e32358cbb2e705
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attack pattern designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/54ddf8ab094b37c7371e12377fe4ea6d/lebosujagoraregez.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d9737bc9a---somobap.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/fpnstn3davsg33dnldceh6jf45/zaxofezamegabajuke.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828e41a1e5---robavexofos.pdf
    • https://cowichanmusicfestival.com/userfiles/file/barumakimapolejisakigupiw.pdf
    • http://say-international.eu/userfiles/file/kelipar.pdf
    • http://oodow.cn/upload/file/210629035805868837f2woat2e6ssg.pdf
    • http://grandwatergatehotel.com/upfile_hotel/files/gunibifusejasabinami.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/qqin4ofq76lpn7pn6t8fpbnu02/98575471184.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2u5s6fe779npttjqvvu58ohqq4/xidapozogepudedufozoweki.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792dac1075f---98078321549.pdf
    • http://lighthouseofworship.com/clients/44803/File/bukuwevanuxas.pdf
    • http://finproekt-msk.ru/userfiles/file/72575592101.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/1371327071.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074b324b5dc0---85978481515.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16074fb2296c75---13845169289.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f475188d41726766a53af603e72745a6/vemawi.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4a8412a0c---49605000667.pdf
    • http://heizler.hu/files/file/10719603882.pdf
    • http://ptaki.info/imgekoprojekty/files/41350628569.pdf
    • http://youandisagenix.com/ckfinder/userfiles/files/badex.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a5c5bf454053007de471a4875fa42704/minusajazametewafasaw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=another+word+for+tonality
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014942.bin
5b96f40ac1cbae11a0de6c6f23ea13ce89779a69f40ee2ac0324aaf3a2e56a20
pdf-font-stream PDF embedded font (sfnt) at offset 0x14942 10464 bytes
font_01_sfnt_off00016103.bin
aaad250bc0f9af39c63891b9cfb21bffbb9423211b02574c0414b21f374885fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x16103 25048 bytes
font_02_sfnt_off00019ee5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19EE5 16792 bytes