Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1f773c9706dd7f…

MALICIOUS

PDF

92.0 KB Created: 2021-06-29 20:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c78442e9730cef8eb0b870012d76d0fa SHA-1: 584c17d670dbd46ab26c8148440bdaf779b1cefc SHA-256: 2f1f773c9706dd7f485f1d76bcaa06a651601cbbe4ca74d05655612f38e508a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, suggesting it is used to distribute phishing content or further malware. The presence of external URIs and link farm characteristics strongly suggests a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://philabc.ru/uplcv?utm_term=constitutions+of+the+world+pdf
    • http://nakatka.com/files/file/54767170285.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2acad20f42---88472270357.pdf
    • http://eotp.info/sites/default/files/fck/file/50062473087.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/p6qoqf0oh6j4dc7nh7pb8i36u1/58369279574.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/it39ad3uptkmtad1bahcsbsrgv/22243145460.pdf
    • http://kimdaiphatsteel.com/Images_upload/files/tiluwitakemaxatub.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59586fa6d---tepuvujelazijib.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec5d82dfb0---nedexerozibigilajo.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/0e65109deaf9214c30e4664f4c50b07b/jijimi.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d69c0d27fee---gipevurigelubizalolut.pdf
    • http://parfumerieindex.nl/images/uploads/61885559153.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/90538039360.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2422a657---nazujewomaragobisosareg.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/c41e70c9fd337d9e6ceaf08a013f245c/futimusamotitatozige.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b97462425c2---geluparote.pdf
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/14162842976.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/mavokikenaronujajotuza.pdf
    • https://unique-u.biz/images/uploads/file/nowelogez.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609482788f926---sazojagekesejujexe.pdf
    • http://apexnepaltravel.com/userfiles/file/dogufujisibi.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607067adcbe84---64645339646.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a9c0f230b---wabazexuk.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887038ea292---68492082750.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe4106b6fd---gufapezelajokeri.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d24771d2cf1---8974390053.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88f30ff23---dazerawebukuf.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbb4a21391---84498638087.pdf
    • 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_off00010423.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 16792 bytes
font_01_sfnt_off00011c35.bin
6911443018456fd6a4fae37bf671fc8863c578383d038535356542bb4d17ccb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 18236 bytes
font_02_sfnt_off00014a5a.bin
c40bcb83032dd00134a6d500693bca0b576a605e82276f47e279da6e5eb5fffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5A 10648 bytes

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