Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f44ae3f9e00255…

MALICIOUS

PDF

84.8 KB Created: 2021-09-04 12:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 54da8b23542104e8592437a408c365a2 SHA-1: 2f3cb4a2bc4967ae3e4544694f18428e672392ce SHA-256: 85f44ae3f9e00255ff59e23d7c4e8e2ff8eb5602abdf88f32a58ee9fd793266d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites or disposable domains. The primary goal appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pingthye.com/userfiles/files/pamatexuxifa.pdf In PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/c5398e0a63d4f397a005b4c7c040ba14/fikoxumotefuwusomej.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/95659965529.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607010987f59d---bugumubujinibipet.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40154782155.pdfIn PDF document text
    • http://rafaelokazakov.com/file/wukererulafowivewam.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607429603ab26---45578048458.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11cfd9c103---bekasudinox.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ee7b2c15410e900555dd0d7a3818cee3/82985994871.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/46baf1f5b7176bc6aa9d23b892c899f6/bajalopelunuzawigirutif.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/47939031071.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/muzotularajutolubos.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/35708025570.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/0e926887945429ad6ca6137e1a4ac07b/vezakekegijozimifaj.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/53779037834.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/314093967.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a0465d3de---niroxotebipawusa.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45a82589f9---87925273203.pdfPDF link annotation
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/860b1e576c3d96ab964504e70ad49e28/64300881234.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/15716790257.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a93ff20df---69764870042.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90b2c90715---14041071531.pdfIn PDF document text
    • http://potlista.com/file/files/12264090799.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kheemd2u1mcvh9j8b7r8mblsp0/jilabuxedoxojawexas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=heart+shaped+box+bass+tab+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_off0000e471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 10584 bytes
SHA-256: ef1f0ba15232da404bbd03dac479a711aea6a62ef1bd5f2f89564dfa9fcb0f6e
font_02_sfnt_off0001148d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148D 18816 bytes
SHA-256: 62633468e02b1225bcc8a10539f1af8d95a353c94b8d74e2f82f530f235a1538

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