Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1adbf787697a27…

MALICIOUS

PDF

104.8 KB Created: 2021-07-23 00:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c0d855f173694fccfd0aac2a73d67b1 SHA-1: 09dfb886ac3b7b0b54b43cf0cae82c0cd51d5906 SHA-256: dc1adbf787697a27c3ee2dd6043c63bf58cbd168747f9f1f7ac36d53bdae3f31
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alituncer.com/userfiles/file/38441249795.pdf
    • https://watertorens.nl/userfiles/file/lusovulubapexekeloluduma.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9478ba4271b4d300ddfb6df92886d131/taniwusikizijiwukitupuxa.pdf
    • http://freetourscadiz.com//ckfinder/userfiles/files/kisama.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858587c2a91---xipudoxuxogafovurawutoja.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8ab9bc7d---filolejedusinijojadu.pdf
    • http://55thocscompany.com/clients/62662/File/54576794657.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b218fe48d8da94e37db09139d2dc5e2/rovebarenolevafuf.pdf
    • http://maychamsocda.vn/images/userfiles/file/jujudefamasufoteruza.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e4bbbf8cd---28847900419.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/tfdguu9klk42vgovqaj798jfk5/nusapobirijenefi.pdf
    • https://menu2uplus.com/images/file/dotipowafop.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/3fc8ac843d117b910c6a4c5661a3ba6f/98755903524.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/fb3c9075ef60c9f1b60b2482e49ff81f/lugejoduwugemovabagoribid.pdf
    • http://chpcentre.com/files/file/purevagilisopuni.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/voxusejalapipoxetikefo.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609219e8988f9---xulevolovewotos.pdf
    • http://ekotop.eu/userfiles/file/xuwagasudoxodosuv.pdf
    • http://casaatlantida.com/userfiles/file///14124361046.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/1tp80tkqev3erogqhnvombq9l2/1255625261.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d9d90b2eea66756f07a61631fce790d1/varukuko.pdf
    • http://okna-stv.ru/userfiles/files/37629740934.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c897cbd9a6f---subekirolavedinawomox.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608633c683105---lodutidavamavowot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=tomorrow+i+will+date+with+yesterday%27s+you+anime
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010be9.bin
3bb2f64936b2622f1cdd0079321a4c4f1f88d5f649541a1e12b2cc31e6776145		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 18200 bytes
font_01_sfnt_off00013b75.bin
97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B75 16192 bytes
font_02_sfnt_off000150f8.bin
0064b4006e001829316c91ecbe09ca5d771fdf9b8c4855eba745290e6555fc85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150F8 4360 bytes
font_03_sfnt_off000161f4.bin
4fc4bcc0a1dc9f830b64deb75259ab2eb9cfa076ff7f246c18f4e5cac4c8a91d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x161F4 10808 bytes
font_04_sfnt_off00017ac5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17AC5 16792 bytes

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