Malicious PDF — malware analysis report

Static analysis result for SHA-256 36718980af444e37…

MALICIOUS

PDF

88.7 KB Created: 2021-06-28 04:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e4fb1567ce7cd61336af20b85ac9aa08 SHA-1: 0f1e57a409356093bb562d3950e2e7921c07bbac SHA-256: 36718980af444e370515ca41fb86e63fa5e3be228bbcf381fdefd55deea08d07
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=overpowered+anime+characters PDF link annotation
    • http://aklond.com/UploadFilesfile///2021050117242132.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/kelosobikajojidamaxad.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608492d828467---jopugenokadurivi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/cc1aeed0828c5ae495f3f2e41dbb74ca/kapasibes.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/l9u0jc67jnaak52k8pnj6fncn2/83827838204.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/vepadugotemurajojajemufos.pdfIn PDF document text
    • https://activepymes.com/pub/file/23959204521.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16080b5f963499---15685105619.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c111b4bcce1---mavajexasofimepet.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607df0ae651c6---lefuvowelurepodujoxij.pdfIn PDF document text
    • http://abnicum.com/files/file/repirebufu.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8295ee3cfb---85454261057.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e81b3a883---rofarerumutekupanikorarid.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a6e45013a---73073667636.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/tokulonivujojilisajerib.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8230bd27db---16215322482.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/lagojedonokamuze.pdfIn PDF document text
    • http://intergeored.com/upload/File/kozonitizamorozuxutan.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/54498056334.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/wujumalenu.pdfPDF link annotation
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607563d3e4e64---80712531813.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/36999419319.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/1s3k3m4sv7fk7o2k1th0takma5/45311154669.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/jubeberozofegudurem.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_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 17284 bytes
SHA-256: a3aa0ccaa19a61be62a9e31f5874db4154cdae207e9d2ff206b88b22c8ea9209
font_01_sfnt_off0001247b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247B 10912 bytes
SHA-256: 1a16ea05e3268ee2acf61157f51add20791be3f13674dbf8114094e11517ba3c
font_02_sfnt_off00013da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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