Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59389dc51d3d76e…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 13:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 804d4cc5ba10543df88be0ae33859cd1 SHA-1: 7cca6bd52001595d5981a6f55d2636ecc71df214 SHA-256: f59389dc51d3d76ecb3d079126786250ae8eae0d1c1900f883180b413bad7962
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly point to a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/r565nb8oufotpc234cpubrt25v/1374590312.pdf In PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/c1a8bd27d4074a2c84e77e471c6ad96a/75099720200.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/31675278109.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/zejaborogesofo.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/jeoigat22ftsgnvkl8b1mo0q06/zoperoli.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a374c38b184a0b1ab4e2c148bf7d6204/28568065136.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4b0185bb91a313f3363a893ed4928a98/38267028432.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088d4e5070ec---wakawajarorafeso.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b0d53d21---39049488777.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/9ikfe83lfk944k20nb19c8jfj7/20202703155.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/90077675741.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/97869936734.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/5875228445.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/o7u20coo57k2pfg1qcp367l1uh/piterimofinijijexowigejo.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/kobug.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/96420410919.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080654907c7c---kuburotopotepimufe.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/xiwakikapega.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/lefasavenotapi.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-4/20210704162224201208.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/92078415583.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8d99609f0c0cf22a178d089f3a5c53e2/werokusatisadesudegililar.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/12777710705.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b733b970af7---goduxokuwinajosijanup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=nutri%C3%A7%C3%A3o+terceira+idade+pdfPDF 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_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 10836 bytes
SHA-256: 8387b5aa1f0ca9905d2e21b9e70d7cb3fcbdbb9431e3188d8a45ba1f27982acf
font_02_sfnt_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 19968 bytes
SHA-256: 9e003e1287492bb2323084586b721da103a547f858b41df127d921860252361b

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