Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2774cfbe33056a…

MALICIOUS

PDF

82.1 KB Created: 2021-07-07 05:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ebeb11bb45f498cef9b4040ab8c28dba SHA-1: dd8d30ad91c35fd74c5e88880097179fc41aeb39 SHA-256: fb2774cfbe33056a150820e49dcd523412ad4d3fc56ef07353e158f994920350
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. These links are likely intended to redirect users to phishing pages or download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=how+much+can+a+corporate+lawyer+make PDF link annotation
    • http://amphorabeautyclub.com/campannas/file/80879824025.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fe7ba396c---xirudibagexekubeluvip.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e573737---rowowonawuxozuwa.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/24253596826.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3f540648021359a50447da03c95708fe/pugotewog.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4025189ef14fcd7e8c532787cbf0326e/81704973776.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2473853f24---21356797243.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/zagukapiwelam.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160981c20a67a1---raropuxawuzezeku.pdfIn PDF document text
    • http://kotolantopeni.cz/file/78157118329.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815fdf77ce6---25848950694.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/begovowojivenexinebad.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/zejipenoxugubumuvolamekux.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8474c679---bezaf.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7f4b2233e---85325928736.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfbc5666fa---refozozutovani.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/86477154332.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cde8fdc496---setesizeguvov.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/dugimimunobukesid.pdfIn PDF document text
    • http://vtaky.sk/media/file/benoxazanusam.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/vosum.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a013eab59a3---8449997876.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a88f8cba06f---40941998855.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd4c53dee0---63836070118.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/19314604462.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/kagamutijegibokibowikirud.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_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 16272 bytes
SHA-256: 50ebc5094ddc10d44881addeffeb779e407ae1d1669e47545be60b3db3b7f520
font_01_sfnt_off00010a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 10764 bytes
SHA-256: feceb2c984f1c7f2ab27ddfda5d7b2b8c27592e1d240304e6f5261f33e614983
font_02_sfnt_off000122ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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