Malicious PDF — malware analysis report

Static analysis result for SHA-256 33087b4510aa02c0…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 12:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fabefc0f68884386486b1d53cb3f3bbe SHA-1: 5c1d0a926602fa626a46465b1253632427e0b165 SHA-256: 33087b4510aa02c0f746cb1ebf19220f93505563952ab3d1296695e3ab195680
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 compromised CMS upload directories, indicating an attempt to distribute malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links on potentially disposable hosting further supports a malicious 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://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c11c5ed95---57104026977.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/g5e7nc1oqshe6sccl2ktmtp183/37702198893.pdf
    • http://wildzipper.com/clients/wildzipper/userfiles/file/28435952907.pdf
    • http://coiffurenais.com/userfiles/file/zijiwakerodidu.pdf
    • https://vntdc.com/upload/fck/file/53169213809.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/58869222395.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160907b27cb240---95250708769.pdf
    • http://alptw.com/images/files/webiwar.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608994bc4ba73---87365509783.pdf
    • http://aloeverajuice.cz/files/file/90492706951.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/3dbcbd8361fb7afa62ceeef53e8caa7a/74888141390.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/gevejubusaxarogikukujela.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/g6rgnneqqf9a64ppbaj29bsj4p/foditegamatejaruwasid.pdf
    • http://kaizenlife.com/ckfinder/userfiles/files/kirimozosasaxaraxiruwazu.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904aa51516f---zegefebadobofow.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/bivir.pdf
    • https://granchefpremiumfood.it/file/93715316482.pdf
    • http://ohana1bbq.com/uploads/files/41664066231.pdf
    • http://udelimpa.es/ckfinder/userfiles/files/botukanagibuven.pdf
    • http://heatexchangersolution.com/upload_fck/file/2021-8-5/20210805181931526031.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c8e69c00a3b631842573b7aec86e4751/71094018042.pdf
    • http://2990592.ru/ckfinder/userfiles/files/sinekolilelima.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/lepowuxizivuz.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/551efc905c7e9c4ad967117a4b6ab69e/32375995482.pdf
    • http://atut-biuro.com/uploaded/file/gajel.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=introduction+to+cryptography+springer+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_off0000d2c0.bin
54b8ed89eba2da701b5e6a4c85efd5cebd7dbeaa01f9712357e36ec78557c1b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C0 17960 bytes
font_01_sfnt_off0001011a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 16792 bytes
font_02_sfnt_off00011931.bin
d402512c24016029010ed5dd961c91e84284dae5683b6c23d9c93e769b9919b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 11016 bytes