Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2fdfabc7affec8…

MALICIOUS

PDF

88.3 KB Created: 2021-08-23 14:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5896cc71791d000f69aae8d643539fe SHA-1: 4d328be934c1a1c2fe1a1d38ef03febc140f5ffd SHA-256: ae2fdfabc7affec8d47428f2ba9c6dfac0c5aadfa3fd818f7abdfd49de2240fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b309b5d38---xerumerijib.pdf In PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aad7f0912---rivusupexepijaxarikuz.pdfIn PDF document text
    • http://nature-revive.org/files/file/darubuvamasinopedibatos.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/gekedo.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/xadirediza.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a23677fa8---39454755096.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/metixovudebokupipinoz.pdfIn PDF document text
    • http://mosjob.ru/images/file/texixasefofikavip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608191487589f---45678959879.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/78511941617.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609457f9823cf---92284752655.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/87488657409.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210529012247.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/44392999188.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/1bmb8t0q2vfrsrlqrgnkcms247/24676887471.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a50e3b89b8d---60667466261.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/woropafotewim.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/lukoxanezegolimor.pdfIn PDF document text
    • https://edgecs.com/documents/delelapegefoginidijabini.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/cfilc5ev6lrlv9tjdqtuko2rcv/tabevimejarojirafedirera.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/50564882022.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/jilexadolipamot.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/e4911ced17a793b45bbac468244073b5/14421648413.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/viwebemibukemud.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02134d141a---81793072510.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8f1b414f98b8ec0c68505d7973714d5f/44001956118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dynamics+and+relativityPDF 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_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 10592 bytes
SHA-256: f21b8030483f643967a933d1b7e0455d26d47dfcbb51ed298aedab48853a237b
font_01_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 19276 bytes
SHA-256: f96831fd9df311587a58b19b06c43a24755c399d2a7307f6b00f045bc446dc6f
font_02_sfnt_off00013ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1