Malicious PDF — malware analysis report

Static analysis result for SHA-256 0707c32566b498b8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 19:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b3aa1aa7c60461ca40ca3444128d00e SHA-1: 2882aad327cbc38ac353b827d18eaeff3210c501 SHA-256: 0707c32566b498b8032e2b49fa7b747751e77d619854695604040b3a09b353b1
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by an ML classifier as malicious and contains multiple heuristics indicating it is a link farm pointing to compromised WordPress uploads and disposable hosting. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document is designed to trick users into calling a phone number, consistent with tech-support scams or callback phishing. While no scripts were directly extracted, the PDF structure and link farm behavior indicate an attempt to redirect users to malicious content or initiate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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://www.deco-interieure.com/userfiles/file/64532634540.pdf In PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/j518r7rh0lr2odu64e807s9adr/39256880331.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/38kcernep9ge8rr6u3qe7kgpuo/wodilafazi.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/kibazerunagipajekerixagav.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/rugimekomil.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/1de37ecbaef9251bb3eea1bdd3b2d905/95817286226.pdfIn PDF document text
    • https://conberraquera.com/aym_image/files/18305433539.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/zadugeseliragagidok.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/42307743247.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aeeebe9a8---nigek.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ac8f30c8c2d9e053f10d614a99ace306/22079700542.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/lulolamar.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/movalarowipemajudita.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/zawaxufag.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/62515150419.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea4f8a94e1---90306473874.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/41973025529.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/mlnd3olq1kad60r4u0leqsnn34/37216057256.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/58763489484.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/dugedijawetagobijax.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7271579e14abb692373abfed6b3247f7/verawazujilusujirowebomu.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/66691183022.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc0a730ddb---62782688174.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/39868499597.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/vexotol.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947af94e83a---55480254658.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608576eb0c84f---89345926130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=fun+6th+grade+math+worksheets+printablePDF 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_off0000dab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 11404 bytes
SHA-256: 5cf9b3ca0a47e94d60d8b7b843a72e5c5f81bdaff0d71a7dcdc7e74e72aa9fc4
font_01_sfnt_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 16516 bytes
SHA-256: bf3c26ac97c583d4937e321b9838c8b1be358b023c2653c06496199f6f821abc
font_02_sfnt_off00011ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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