Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32f8513effb5481…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 01:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f1a31fd28f25babba86461ba7974a9df SHA-1: dfe39ab74b4fbcdbca71d98ff527872d32036891 SHA-256: b32f8513effb5481babcb958bcc499e483b630ca792a4d74a1443dec8a3285b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a PDF-based phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=correct+tongue+posture+before+and+after PDF link annotation
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5d6baa72d---91585541386.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b026799d32---powudutavatiwanitune.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/batalodovoko.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/kiwuxomufibo.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210803090439.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/bepibefofiwozusipejaxed.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/vosekebusajogod.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/59518124399.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/77769597404.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/46079292583.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d21c1757a49644b20c0322218aec772e/72582398463.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/mitemalemudakavosovulige.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/xidosuzajujap.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/64714834920.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/guriwibonodigefumuzuxip.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/5305663201.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/72782529487.pdfIn PDF document text
    • http://ubest.ru/images/file/27543920013.pdfIn PDF document text
    • https://btegypt.com/file/gajogokilifago.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c987a4291b---boguwadaxukobaxanopigubu.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/af4b1e2f3c7a1ce4eba1b5f804ca664e/jiredanopejeg.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/66248735247.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608d21a62fd53---68059104696.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826779988ac---83684364201.pdfIn PDF document text
    • http://rc-modeller.se/images/file///vuvupewakunalagoto.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_off0000d454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD454 10928 bytes
SHA-256: 4ea54b3a9143c84c7791af6843bad87c053eae671cac0b5c74c446f3f80f8d42
font_01_sfnt_off0000ed62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 17804 bytes
SHA-256: a74266f0230a4fec0f220d19460c2d5228a4357d43f81a7c8d9e995e615a3b1c
font_02_sfnt_off00011ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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