Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad98fd9a87d50497…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 09:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f61f771229de032837b6e7e4c9f15d7b SHA-1: 562fd6bf52593a701cbb12c55e72689b70932bb3 SHA-256: ad98fd9a87d50497f70bdab75aa0ba238906be65f5a412c5acd76b3c0618f483
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and link farm attack. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content hosted on these sites. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b535324a42---miliguzetomov.pdf
    • http://comp-art.ru/userfiles/file/pasadavababofemesuzi.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a404b5c7c987f30c7afb064ddb0334f1/mozavo.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc4dd964e0---51846313673.pdf
    • http://herve-coiffure.ci/files/dedudofevedazivijade.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ba2e079183ba1f85488bdacd30b84ccd/92514399335.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c30c3db1e---memimidimilivasomekabufuw.pdf
    • https://biovuspharma.net/userfiles/files/96171512681.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/95feacd287e15b538da3b4ea509f3b05/dobegiwurewo.pdf
    • http://wksx.top/images/userfiles/file/89390812684.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce2efd1d28fc74a6cb8abbef8311edc5/budatobuboduwosamezilazop.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89236ca2fc---fukajagaben.pdf
    • http://thietbixanh.net/uploads/files/padiwujowuwetugipiwoxoser.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8ba789ee3---xazotitaxixezefagom.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/f5hcv029kojtoulbfc9vmcth40/3344349143.pdf
    • https://aurorabersinar2.com/contents//files/6932634066.pdf
    • http://szentimresiklos.hu/upload/file/pobefabo.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/570679c7b38586f9da9316d8fe562483/78276342569.pdf
    • http://poltinik.ru/userfiles/file/39764808000.pdf
    • https://theshamrockpublecco.it/file/68009150568.pdf
    • https://alihuata.com/userfiles/file/nozexiga.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/627503dc21ab699b814b42a893fa5d86/39754476821.pdf
    • http://artecgroupservices.com/imagenes/file/xubosaredijor.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/864e6e3127ac88aae5595c72590fb8a4/30352926863.pdf
    • https://chmelo.hu/sites/default/files/file/watodopajubijek.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=one+to+one+mapping+in+hibernate
    • 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_off0000ea8f.bin
f1cfa2ccd1b825b80ef55b6b96bf4444b882dc00ed18c790ad6d4f7a6c4aeeee
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 10648 bytes
font_01_sfnt_off00010279.bin
15acba41ddbf95f81bf63470afb3d2b60068faeb16d254186fdcb76f0cef7c4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 17160 bytes
font_02_sfnt_off00012fb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB7 16792 bytes