Malicious PDF — malware analysis report

Static analysis result for SHA-256 008b977d79caf9b5…

MALICIOUS

PDF

87.3 KB Created: 2021-07-04 00:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3bba0c9979ffb98a56676fcc228f082e SHA-1: bab563e949010ef5dba2b677b0d9dc34d45b85eb SHA-256: 008b977d79caf9b55d78ab4feb286630f88e0d36c5a1e4fd87b9c9bea601f9fe
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute traffic or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=life+expectancy+of+a+chorkie PDF link annotation
    • http://kamkmori.cz/ckfinder/userfiles/files/rijubobojadase.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16097daffbd7b7---pekefuvejogitig.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae9634b9af---5832848126.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160747bd06ad5b---kovexesizaporunadajuki.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5c3bc992---sakefojagifadawipuxeveta.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a8fd8819c9bb4f4eaccc55c8028ff8bb/31139549707.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0352e9cdd9---70728310961.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/baacfa376fe6d9a23e00ac60ce5adbbf/nerikokowesosivena.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/82517543437.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/afe5ce4ef5e552f66f2c55d5752d7033/40539089639.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/2554825146.pdfIn PDF document text
    • https://ferropula.hr/files/fobenaxixug.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/komakiveki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cefa62c53b---72370721616.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/dupejobiwedanoribafuzuvuk.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/44480939083.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077e35b9c3f7---13600566265.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/6571029679.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/cc64047e30899d785a03aa52298fe58f/livikegalu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/77btjvnjrespp932e1lci15l33/kisaxowoje.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/17754381462.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/bvbr82otq6ott20tg2lrrssmdf/69875960590.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0859b562e6---pojifexeki.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/kce096ujanl20m87sdg89bfea0/54378385249.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46265d1b01---rotanovuzozaxulebir.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffa2aa2175---10612972317.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_off0000f23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23D 17440 bytes
SHA-256: 79b00befc60a485b5ddc3e7b9c0d31e75b9b00f038953983c8cb78baab326829
font_01_sfnt_off00011f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 10628 bytes
SHA-256: 56ab80e92ad2f3fc86ba197b7b34de849ab6aa348b59716abb3aa39eb898c0cb
font_02_sfnt_off000137bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1