Malicious PDF — malware analysis report

Static analysis result for SHA-256 07bd290a412bf679…

MALICIOUS

PDF

86.1 KB Created: 2021-08-03 15:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7eab4a831e36a2a7411c4954e3595149 SHA-1: e7b44b8419aab2be257577a53d0d487bdd6a0df5 SHA-256: 07bd290a412bf67972bc33c438e0c4cd8dc63898a450fe5c1d7652d90ec76dbd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript could be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/gpesncahkjpujplqfe7057l30i/85959658873.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/538ac8da95ffacbc3fd5052fcc4a2456/nutip.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/76092657489.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/13321005126.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/m7suvcloe50fioul6dovu1r3co/24332098545.pdf
    • http://finalstage.biz/js/upload/files/wezepibu.pdf
    • http://jamessham.com/admin/usercontent/file/55167241042.pdf
    • http://bhs-class1957.com/clients/35434/File/juzamonulet.pdf
    • http://tiyuchangdi.com/upload_files/files/20210713_155120.pdf
    • https://edbcagliari.it/file/63763674295.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad122f6bd43---5484381278.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b41ee49dbc5---ladaf.pdf
    • http://geonatlife.es//ckfinder/userfiles/files/60475573809.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/859a3518c977d78865d649ba91901dd5/80445377142.pdf
    • http://wildzipper.com/clients/wildzipper/userfiles/file/96315440087.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160866583829d7---mefegavu.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609f41068153a---duwonotixirun.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/18712574703.pdf
    • http://adveotec.com/img/file/muwowexadanexej.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/nebemeta.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3340c7f0f---66096608564.pdf
    • https://longhoang.vn/upload/files/44108674005.pdf
    • http://drivingschool-brno.eu/files/7336617557.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b363aeccbcf---65040687813.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+descriptive+test+in+bsf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec29.bin
3a357f59a1ce4749738ee5ba676d8291de17f612bb2693afa7298b5cdb2312ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 10748 bytes
font_01_sfnt_off00010496.bin
6d4822bfdcac831d89b22645588e09f09d088ede9505eefe5bd9e46ff34539a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 17164 bytes
font_02_sfnt_off0001313a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1313A 16792 bytes