Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfd4f65ab80494c…

MALICIOUS

PDF

73.4 KB Created: 2021-08-12 04:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14572b3ff8fbed628031cd9903f7d8c5 SHA-1: 035aa61a7bfda2995f4bb218d2c057c98df1e01a SHA-256: 3bfd4f65ab80494ccb25856d03e3fa535bd3ca033265f28fe9c90fdd3f54c126
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=finding+area+of+shaded+region+worksheet PDF link annotation
    • http://matras-devison.com/upload/file/28314144230.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/14425009754.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/69f9b516bc87962e6b418915f03d7dd9/73548789225.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/98499764448.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///gamagetedemepimisor.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c880046b8aa---tofirukibuwixonujubuz.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc4424036a---gogavemeditaxazo.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/32584274591.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c6aa7ae3---fuladajox.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745736ed5dd---zoluwim.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65d38a34ec---63620718213.pdfIn PDF document text
    • https://ski-experience-japan.com/images/blog//file/lazomog.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/55cbbe2f199d64d3f3b939315e870aa0/dodujizolumilazaninif.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/753d1152cb12243b7b0ee7184a9de268/78768934087.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5de233c5a1---furejubexa.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/dosajutanesokukudotibewaz.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/83ffae33c08f01db62d7f2b108f1bf77/lofitukevamenedubekifo.pdfIn PDF document text
    • http://belloverde.net/emailer/file/gifikem.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/78697329720.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/wegufalatukame.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/32ce4f6deafcc16bb69427f2a34abe9c/rezifukobixuropawefevija.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/61280318976.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/63452559404.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/daxinogujapuzepaj.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/sukixenijuwom.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_off0000bd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD53 15632 bytes
SHA-256: 99be2cf10951931a55e1aa41508f70590e008149883e579d5ec26c4903f8fa12
font_01_sfnt_off0000e561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 10740 bytes
SHA-256: 603e7169952c83915ddb4af681b00d9367bb8363b45ada29cf942be065399819