Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe5b022652697d1…

MALICIOUS

PDF

75.6 KB Created: 2021-08-12 00:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 73e65d38e3e765eac46d27f12fdb58f6 SHA-1: 00f61e3c1a7c13003517e51976bb91f8ecd88d2f SHA-256: cbe5b022652697d14f542026449407394a7f4a98ac1a41db50e57fd4eb49bdbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://wastran.ru/uplcv?utm_term=how+to+use+wearfit+smart+bracelet PDF link annotation
    • https://listapp.in/ci/userfiles/files/82861920750.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/detisutasumezinemufa.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/kafosegosatexixesevijexa.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/fogt32bia7e3l0oo73gl1i5tkc/35774058401.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/vivofopijavujozunazewem.pdfIn PDF document text
    • https://medius.sk/userfiles/file/22897115919.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2ebb58e24b5bad8f711672bcddca4a2/luperosili.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9ojs15e83no1ecl8lplih1765h/76581974458.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/6e9a6a38b87331c4383c3bd6f7589d67/pizujaz.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/661822af07abfa4124c48db89e96b1c4/miwakatewipimadudinana.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/savipejukizupune.pdfIn PDF document text
    • http://limoride.net/gallery/file/sizoranimokagewizuwufe.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ccc2654cc2109ae544ee484c3b87b935/53694655741.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/bagivolel.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/89762373740.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/75ca5b0ffc2d178f77f53c34239e5a56/dofumarowukuzodovabasipil.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/wiwizobuwifase.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/6092ntld4tgb1k1qislfu952na/fozor.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/dcd6436ef745489a5ac13548bfb5e580/vojidojoxekegu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2d918f75f495d33eeba430ae4d4dcf48/35461728472.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/90833378399.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/0a472bad9c7b2e80db62168d886b9b78/2326955989.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/tonedonebabokidoworow.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-22/20210522220705838275.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2efef48b7b---gogerixagosomib.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b3f4719ccdcf5ef20e0a81dae6efc98a/43859226009.pdfIn PDF document text
    • 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_off0000c345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC345 15708 bytes
SHA-256: 99bd48beb0e4c3be669a53557bd98c0cfadd40f80307145404f6b6b189f3bd15
font_01_sfnt_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 10708 bytes
SHA-256: f90c084eba76e0e38bcaa72c7ee1b5184ee597b250f382eeb1f56b62d6a1a6e5
font_02_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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