Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7218771e12576d…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 07:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: efcce35ca33b049e1b69bcfe813efdfa SHA-1: 28c22dd0cc162e47036c4d02f78de2e93bf62678 SHA-256: 6b7218771e12576d3404aa2b6c8b32d00ed268fa5f185b21cbf54e7fa37b9172
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of links, many of which point to compromised WordPress sites or disposable hosting domains. This behavior is characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.haztartasigepszakuzlet.hu/pics/file/4586408765.pdf In PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c93edd81209---50007935834.pdfIn PDF document text
    • https://menu2uplus.com/images/file/33516575861.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/wigamabobewewozobet.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/xujofaxibidonewaxoxateg.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/raoh1knej75kmlv7i0pr4vipgs/51045172613.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3de9218e0---10958172324.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/228918ea48ee38e3a91b78b19a946b9a/5617277057.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/8b6812514abeded266cf1dedace8fdf3/98792182357.pdfIn PDF document text
    • http://grabnerestriche.at/29749923595.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/17cee78a24282fd7c51208ddd0434c36/vufovanuwuzadigi.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/titutabefukapifirepubivem.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/rorisekenujusozavudoz.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/475b53fe6e47a7058be8fda5f6c3a525/97403975286.pdfIn PDF document text
    • http://timebymtm.com/upload/files/gowibezixowadowox.pdfIn PDF document text
    • https://amblamy.ee/upload/file/kiregavosakidewasu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4988a6da2---44648410371.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b2c008d57---89390350328.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/fe35fd5ad41268ccfb5c74ebba5143f6/rivesozinuwusomipaviwuk.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3960334955---fubuliridupokajewitesi.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/zibadudasudigepupumasav.pdfIn PDF document text
    • https://masukpt1.com/contents//files/82985971283.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/pumapavelolufozi.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbe5e5217---69097820004.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=interjection+worksheets+for+grade+3+pdfPDF 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_off0000c9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CB 17824 bytes
SHA-256: 9a24e1d1c58d688f671d19e4b72f3644c45a505b10e9e23694f475fa079d13bc
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 11284 bytes
SHA-256: f9258c47c5c3ae0c162d4fb80882d9d1fa3e5e51e6140d8a96755a65c4488a15

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