Malicious PDF — malware analysis report

Static analysis result for SHA-256 a462bb0a6b9a6ab0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 09:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e0ac19b3b3a0a651445797ae5d72a86e SHA-1: 53467bd9699e990910bb30e45c3a9a3e31f65bad SHA-256: a462bb0a6b9a6ab00e2c05741529849d76d6623e5e702a6f1de34a10a56b5561
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/egfdg6mvb4mgidlso9dg46f24l/welomanox.pdf In PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611efc2f3bf0c---40631660645.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/16784313938.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/jb2m25q7sfb9q4i9h54tfd3hfc/82675895613.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/lixuraluvawominasifiz.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/41091832941.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/76979299140.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c80a09f211664833d64b1490d4cd324b/37706525999.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/wesumavevi.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/43503780547.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d468917c13e---27830194851.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/domeribejamuzidofevilak.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/84438233709.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0derqrrsleu0omde7n1dtqh08k/wuzolezefat.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/82265471997.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/20413907714.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/26312828504.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/setivib.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/zufakuzu.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/saronagipufudirale.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/56319071991.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/ximezojagili.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/17934722143.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079174f9410f---kesorinuliketa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=editing+worksheet+for+grade+6PDF link annotation
    • 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_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 17396 bytes
SHA-256: 4a1e1cedd37c0f8597849ad88bfe59df73df86c0d5d153103a81958a444d73c0
font_02_sfnt_off00012077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 10916 bytes
SHA-256: 32b3e2142140df307af4cf2fa7fdc34ce8b55ad48a5c3bd9098bf4359855452a