Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5395e948f609357…

MALICIOUS

PDF

92.7 KB Created: 2021-07-01 21:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b5c55f881acb6a7e9575accba88ce44c SHA-1: 92c0d9661609d834235a4c559a11f4aaf59d268b SHA-256: b5395e948f60935765ced89c8c9c0b433cdf0ed43fe238fd660f7d80dfbe9650
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external sites, many hosted on compromised CMS uploads, suggesting it functions as a link farm to distribute further malicious content. The presence of 'utm_term=canada+work+permit+approval+letter+pdf' in one URL indicates a lure for potentially sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://garglob.ru/uplcv?utm_term=canada+work+permit+approval+letter+pdf PDF link annotation
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b55a3b385f1---sexogiwitususabupun.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/39464613295.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a795f0b4caa---zazubi.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/29514898785.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6a61e07f6f2660d174a725ec6e6b448d/77015309258.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d225c10761---69550658101.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b04c429aa---mofufegikes.pdfIn PDF document text
    • http://zxsolar.com/d/files/38084127152.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7580dc4e7a45aeb28f54410703a33b4c/31142131347.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/66r32fj211nugspsggtqcooj5s/58208348874.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16085c54e2308f---27904449882.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24ff605be6---xilibifinekarojodat.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/ec74f99dde2bd47864ccd7fec1afde9f/64766954675.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8337cb914---97784015079.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb349cdfc9---fisurumesavipa.pdfIn PDF document text
    • http://innotack.com/userfiles/files/tezogeroxanujekuwed.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4685e2f8a---tobiwugo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b728ca2a5c5---pijokixusoweku.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/23826387170.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7688786f9---38149002469.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ebaceb698d350e6e20aa821eb171b1db/13605566480.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/moximopig.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8b905df8c0df01c993c9e6eee62b7b0b/xubojogibawabaden.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/62362050290.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/3142599247.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607924512060d---24381604670.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_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 10768 bytes
SHA-256: 258addb51f29adf30de1efcc3898b449d640fc7d7c7108c9e4595ec307cf6968
font_01_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C3 16684 bytes
SHA-256: 3c915091fe01c577dc9c0b5d4bf0a2c370ebc6fcc893bdb7f00c5008c47a50cf

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