Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45ea9f821eac8ec…

MALICIOUS

PDF

120.7 KB Created: 2021-09-01 04:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e7c510bcc2d250ad246c14e760f11844 SHA-1: ac16f19666891e9b018fbb31477aa6e71f428e49 SHA-256: d45ea9f821eac8ecaffef6a8acf7226b061fa6f7f0c1e8b14f7c6f16c687ae76
196 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 0.9940

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=kymco+super+fever+zx+manual PDF link annotation
    • https://gangnampools.com/contents//files/49300555643.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e611fe8e879---nukuponetavo.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/juxir.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161206b407c73d---vexelunewavinusadini.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/59365991213.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec4ba76903---kosufatulekidukanipe.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160fc307b7eabc---gafegelukiwekowajarure.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/54071507897.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/fimujiwu.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/387aa04c05467a4333fb70b12fae136a/55062295962.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/35417756208.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/ruzamefevemipotonijodib.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16098b395cd790---zowotipe.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074215755edf---pivupitubeb.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/n3qf9eumig89198r269mdn3km2/41135964631.pdfIn PDF document text
    • http://sport-way.ru/img/file/depuduvojamozazagesajowi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba54f7f33f8---75777913909.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609b0aca5fe25---55432748929.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160960abc125b5---moramitewapetu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4148730b0d---56339636052.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/notepagom.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c17c66a14---71312214906.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210901053129.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88469be9d9---tefubogusadanegabalizu.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/89905013721.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/27600802699.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_off00016e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E42 10884 bytes
SHA-256: 5fb4e1ce3db6aa7d53b4ca9a0c09a4de02d4e2ac8d0bab40e94fea483a7de4e2
font_01_sfnt_off00018786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18786 19852 bytes
SHA-256: 1b4c4de3e0bbe56668ec36b0b9e76b2ed55f257b74860bdf2cfbe3cdd0f85ba6
font_02_sfnt_off0001bb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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