Malicious PDF — malware analysis report

Static analysis result for SHA-256 5069af9db9fda623…

MALICIOUS

PDF

88.2 KB Created: 2021-08-02 21:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e06777315536ec74a859f7aaab0c2560 SHA-1: 2618fb1160ddec28819b770a093adb165f205a05 SHA-256: 5069af9db9fda623750c3b2621f300760dcf3b97506fe95efdda381db5f93508
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://coretry.ru/uplcv?utm_term=osmosis+potato+experiment+results PDF link annotation
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161030afc2e195---dizapetolivawom.pdfIn PDF document text
    • http://shshalloffame.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/futagabogekafawusobeweb.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/godaxupufabudorubifilina.pdfIn PDF document text
    • http://phanbonvbm.com/upload/files/duxutapibevabibokime.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/sizokakuvilobada.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/guwokaji.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/46925616922.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/jazojetajatitibumoten.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/lewupuvoja.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0830183990d18b63f31b1cf8ced551a5/muwajifuvebaj.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/1ac0f6d79a652788e6e835d429ec2e28/59753289405.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b145e20ed2d---33918088816.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/siviwol.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e870bd951e6f3feb65152dedbbfe41b2/zilodalopozen.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4001ff5f---samumezatanorigubejis.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/suxeme.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/wifose.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xopolokimalewedur.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3af26e1d2d19d809ff316a88ba4e510c/parerixujaluwekekuxib.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/49lt638u6tal7drd2d9tqrrqsg/gilusazi.pdfIn PDF document text
    • http://holzweiss.at/69641867790.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/viduximi.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/68e18fb42204010edf2c31627f60d702/7709831747.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/rureligut.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a213f2c628d43fec0ac2f05d5c811f4a/rudasam.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/81135019903.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/t8si8tr80hd20v6kvv1eu6keh3/soleforemuvuvaxoxer.pdfIn PDF document text
    • 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_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 16536 bytes
SHA-256: d7cc2b43763a5f86712616a922bc8831c4be68404eba679256d49929269d657b
font_01_sfnt_off00012103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001391a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391A 10640 bytes
SHA-256: 76bcb511143c8f35681bd3776a77d17d4b605de414a895fee75fbfc55511990d

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