Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf55e4c910120f0…

MALICIOUS

PDF

85.9 KB Created: 2021-08-12 09:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 316b0cec6741b216f4f6d4627cc40750 SHA-1: 00d8585956412e95631e18f37e16f8e06885425c SHA-256: cdf55e4c910120f0d8625ddc94844f27593f8fbf85d7d958e1836faa8289a2b5
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to redirect users. The presence of compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/381f1ed3ec82ca6fb6fa46533ab966b9/40570141340.pdf In PDF document text
    • http://moriefrusca.com/userfiles/files/xevuxe.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/2eec111f1b159c257f5c475d5f0dd843/91240497740.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/pulofatemigutizagenari.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/bigexun.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070c1f58e407---77746508701.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210806_074341.pdfIn PDF document text
    • https://faceless.me/userfiles/files/96753683695.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e77ab09763d---32240871458.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff431d05ce---ralezadegig.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/69447d82be3e99da96ba96cb2fa46efe/visusid.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/dogonalijinog.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/577362795cafae5c07d6bb65850b9924/24789011539.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/42198220948.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/43la30188ho7eo5ujfta0afsou/19787385196.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/v8hen86ad5t58vi1rvlmjdudsa/11235091686.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7f17de760---13776886609.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/93359ebe2e240af8baf6abc09fe5d3a7/88482431957.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dafedb5c657---1282766165.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/zumemuxetudewase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pattern+exercises+for+grade+4PDF 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_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 16292 bytes
SHA-256: 2aed0c9499511396dc3fcf4c607871089619f120472efeee826f06093f694cf6
font_02_sfnt_off00012fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE6 10784 bytes
SHA-256: a885f80783be4b8616abffd97856789496686523a664503e78e73df1fe2eafb9

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