Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd35b7e834db282…

MALICIOUS

PDF

90.3 KB Created: 2021-08-12 10:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 13d280ec0b6d196be6800e3f0308fb16 SHA-1: 698bd40fc0e50677deb3d95d0bf41630c79dc0c9 SHA-256: 9bd35b7e834db282d41ce8b5f60be0eed981f7336c7c476b02e408acdf3e93ac
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Modify Data

The ML classifier and several heuristics indicate this PDF is malicious, specifically designed for credential harvesting or payment redirection. The document body is heavily obfuscated, but the presence of multiple heuristics like 'SE_MFA_LURE', 'SE_CALLBACK_LURE', and 'SE_PAYMENT_REDIRECT_LURE' strongly suggests a phishing or scam attempt. The numerous embedded URLs pointing to potentially compromised websites or disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://kolaykanal.com/userfiles/files/46064675272.pdf In PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51f74118a---4613475539.pdfIn PDF document text
    • https://xigmatek.com/upload/files/xigafigoxud.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b344855ebc---42320538184.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/totabegoles.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f41ac3904b---45979929356.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/8681344844.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/penopomifizazok.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b4907204857---fibulozigowovizumadew.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b801f8e5---sokizatev.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/58647116631.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/rucl84oegrqg7ldpus73n14vl2/19590932066.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/68601368340.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d52503b42---pojasorosorop.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/545895327.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/mizejomavuseramagelive.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b41fdb5c6dc5b0257a2a567d879bb76a/demoxopipavivilekuwiz.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/fimewekutiwe.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/petamepamogu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/rsav1b6j7u90t4k989g5fq7fn2/88111113200.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ccs82vk7gb3e56ffj748jmdm9g/mudajomur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+contact+robinhood+fasterPDF 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_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 17100 bytes
SHA-256: e90803aa2acf8fea44bf7fc6a57f862130e619b1693354735fd3004103e0d65b
font_02_sfnt_off0001431a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431A 10744 bytes
SHA-256: cba6c1aeec700773a92c1b5ea412d50764b44b5406807c8568e8efaa74cca74d

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