Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b56b84e016cd67…

MALICIOUS

PDF

109.4 KB Created: 2021-09-01 01:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ceddde60e06f90a9f0ef82bed12f1e03 SHA-1: dacf9ff853cdd3b2db5acbf7337cf0114cafc563 SHA-256: 52b56b84e016cd6750eea56187d3269f0f10526130d8b1ea022f6a8f0d7eca1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites. These links likely lead to further malicious content or phishing attempts, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42aa982a03---9932884062.pdf In PDF document text
    • https://melnikhouse.com/userfiles/file/9851690106.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612116c203ee2---fuxadafisugetarewim.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/un0bh0fjaq94g2mkvlr9furfb1/6420745805.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd724f602---sukadutob.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/trp9spps91agel0fb3gilju2j6/bilelowoxewefizuwiz.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/sakuketano.pdfIn PDF document text
    • http://momsystem.ru/public/file/fasixogitatimebonafojane.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608157b01d37b---jojeg.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/g8eve95f986er991o61bj1lpt5/gafefun.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/56838008146.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/151136ae03b8ee14141ed99a982148c2/pesemizibusozozelizojiful.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/69610863994.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/5983860448.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/35973514410.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64ff802d5---fazivuzaterukivo.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae4aef2733---65814221361.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/vuzixobuwejomez.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/1926c8bf4d2be8d5b5b4b31b7c418721/874627953.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/kidejejokav.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/burixutizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=patti+whackers+physiotherapyPDF 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_off0001397f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397F 10616 bytes
SHA-256: 04dadd2d56495a3f616b12a29008f0c45ebb7c361033ef76a18f4fc992100eb7
font_01_sfnt_off0001520b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1520B 23688 bytes
SHA-256: 9ac433bbd406b8cbd0edeea19f60bf242f7b0e320b15c567c6234360dd3758df
font_02_sfnt_off00018fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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