Malicious PDF — malware analysis report

Static analysis result for SHA-256 33deea484353298d…

MALICIOUS

PDF

93.1 KB Created: 2021-08-07 14:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bea2d58c08a49bb4eba8ab60f18fd647 SHA-1: 703e4274e39ec5cca5b07549d1213ed670f1e98d SHA-256: 33deea484353298dad7a220c1cd72ee8f8cf86476d1f9a6a4579b5822130161a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised CMS upload storage and disposable hosting, and presents a visual download button. The primary lure appears to be a browser extension or update installation, a common method for distributing malware or stealing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://utuin.net/files/fckeditor/file/47866699959.pdf In PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/fb934cbe3692326cb1303374de50df9a/25432912635.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/rabutidojekazunaxe.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/96949436629.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9c5a7076218f40c0b172bc980e082644/kanapiruro.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/pavurarosurobiko.pdfIn PDF document text
    • https://artbynela.com/uploads/file/83838470198.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1ff7492038d9b2f761884943020936e7/kilugokesuwomu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf80cd107a6---xupanirunobirurixadeginod.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/gedakufizuda.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/nabifomubiwovawibax.pdfIn PDF document text
    • http://eichler-kammerer.de/galekizeribuwafalasepagog.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4c9882577628c4d7f616739e9eb9d93e/tojati.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a9af1295b1b---lebusawipasafigopo.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bed282c7a65---pawuwa.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/fojor.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/67802465822.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/luxubunidemawoporuw.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/gimalirewifojiduvi.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/sgoi08p636qr7rpmn33139lfa8/mumifosamelavixafude.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/vgclbk29grhecaflspf983jif5/sanelogavikediluruji.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/3d0502f54a51791be5efc63145e30ebc/dexafejajenodak.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/503791be4ab3a992a22bc50351da6515/76259135376.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/fuziziwezigubibopipud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pride+and+prejudice+and+zombies+full+movie+download+filmywapPDF 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_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 11380 bytes
SHA-256: 43587f87ee66dc2f5609e41e18923d55882b8c042f1356ab6460df79810706ab
font_02_sfnt_off0001355b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355B 18228 bytes
SHA-256: 10034529046ee657d2aa74468f788c80dd29638dab7d3cd75c12a440813f0e9e

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