Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2d61bde821b0c4…

MALICIOUS

PDF

90.9 KB Created: 2021-08-10 20:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8eb2fcb2433179ed80ad55ba0e73ea3b SHA-1: 5e1d2b763de7448fdd9d0af5f8e2d8bad799c2c1 SHA-256: 5c2d61bde821b0c428f98b839693c279d97d4265165ffe0e0654affbd7a6aa42
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The presence of multiple distinct hosts and the use of UTM parameters in some URLs indicate a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/4b7a0bca9f36c4aa6c4a1c0248f2d32a/jutikegavovufiri.pdf In PDF document text
    • https://alutat.com/data/file/63146149322.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/7782806402.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/11785653636.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/dabupubafenufupub.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8ad063de5---joxutebowom.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/1b532167db8e1d09ebfff2fad054352f/47550833099.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/paxajesit.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077432940b3c---rozufamomijarelur.pdfIn PDF document text
    • http://learningkey.org/userfiles/33014683545.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/doberiwatosikekumutupe.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ejpauhe2f8nuq7cg6bknhgv7fe/lalavoka.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf53bad6e79---70972386274.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/21608836439.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/386cdb6c89404f073a06ea130a093d68/tenefi.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/ziladopiwixupap.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210717_39396DC3C52BE274.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/nenoxibitatesiname.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089e7d6379ca---vuxojufevimotejaz.pdfIn PDF document text
    • http://aimic.com/userfiles/file/23546854788.pdfIn PDF document text
    • http://dlzj.net/upload/files/2021053008331894199.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/67260909910.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ee8f791675b7fa4b9648830cec66273d/lipagofafat.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e4e72811b---giruxonagirirugakavajefo.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/84652831734.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b9c69da8f---84697213096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ffxi+fishing+bot+2020PDF 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_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11687 17728 bytes
SHA-256: 9d3d12bfb215a200e144a665e61a91d495219e9814f0816e580af01be7f13ff1
font_02_sfnt_off0001454d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454D 10512 bytes
SHA-256: 4a4c4b338e4af3e8703853c762382dab839a8d7e639f261d902af348d713984e

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