Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7435b93db30982…

MALICIOUS

PDF

97.2 KB Created: 2021-08-18 15:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7cde63a8ca948300c0a7371df807927f SHA-1: 101e83b945a6da015c54e964e66613c951c3898d SHA-256: 4d7435b93db30982ab07d2659a5918175ae9cef0f7cd1763a0a690809b10ab2c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to various compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic indicate a phishing or scam attempt, likely directing users to call a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://inwebjor.ru/uplcv?utm_term=best+way+to+rehab+a+groin+pulled PDF link annotation
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d8e31d7d1fd9233133d5b50fdc0fd259/wurobifexira.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/b121de5cd9fcf6d76d6b96ba183b95a1/busakitefuwe.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607200a16c900---kaxejobilemokufa.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/6228460623.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4fe112710---91696935216.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b768bff9---nimozozeduvusositax.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/51793290931.pdfIn PDF document text
    • http://metall-press.ru/files/97868905138.pdfIn PDF document text
    • https://bibliothequeanglaise.org/upload/files/sitokig.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608524069f5b6---27629610799.pdfIn PDF document text
    • https://hgb.se/filer/file/92387129192.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/lebesasu.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16212427080115.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091f67f22e55---42417118590.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/93233319491.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210627174436.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161130faf6defd---tunitukekufunazonamidow.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2a8148b00---55134892172.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1056ea918---funadarirowe.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160845bce29f95---sadoguwaxajovetop.pdfIn PDF document text
    • http://modern-pro.ru/files/file/munowunagaroniw.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e2911a77f58---siremuf.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c16e19bcf---16925011409.pdfIn PDF document text
    • https://micsys.in/userfiles/file/gefade.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_off000115bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BB 11164 bytes
SHA-256: c39ef9ec6bd16efdc369977ecb97af61e1e90476dfe12f6674dfc82b3e82ca58
font_01_sfnt_off00012f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6C 17448 bytes
SHA-256: 959f3afd9742b8a8a1e429cf9ae40670b800b3904b4e94071e873b2ccc5f59fb
font_02_sfnt_off00015d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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