Malicious PDF — malware analysis report

Static analysis result for SHA-256 5111537a8ec9f337…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 00:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53840f9f2cf5550b634c178b1122e4ad SHA-1: c53d3e45850c9be67dc9e55450830d1b586fb6c1 SHA-256: 5111537a8ec9f3376c4c2038da55d9b72f22a503fa8cb7b3e7cad460084f6392
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It impersonates USPS and contains numerous links, many pointing to compromised CMS upload storage, likely to lure users into providing credentials. No scripts were extracted, but the presence of embedded URLs and the phishing lure strongly suggest a credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=postalease+fehb+worksheet+2019.
  • 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://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/572464a64cf5283c387d88369864107c/gawigakisedisubeziwurogoj.pdf In PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/51978548241.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc89d4a01e---renasunuredagigu.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/85fc2s1fbtl9t139atsd8loh1c/12273844526.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071fbb5da5d8---42380628496.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/zefoverekepoz.pdfIn PDF document text
    • https://designclarf.it/file/kekawoberixafitutakebow.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f4ef59ccbf---1818870095.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d680ad1f092---87722956555.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/68960473996.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/54066247816.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/752cbb068d1ac70467d03be795af7615/66268571592.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162403382098.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0ef2ad76---4109940365.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee4f36e870---mefonir.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/kajizomimabixolomema.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/32593333692.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/sufizixizivedave.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/14305089768.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/21014013556.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/wekizat.pdfIn PDF document text
    • http://gabortech.comadmin/file/jesevupizemedijofe.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/wosakarigameliveluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=postalease+fehb+worksheet+2019PDF link annotation
    • 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_off0000df9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 18784 bytes
SHA-256: 7c4a05a0ef0c8017e77f1972fc209c2cf1b005d5186f956933ef0aa655d1fe17
font_02_sfnt_off000127af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 10896 bytes
SHA-256: 44b0169f1586f075ae138f0aaee5150d004b6e37f1c2b6b71c0f521391fc9aa6

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