Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8988c2a3622150…

MALICIOUS

PDF

90.1 KB Created: 2021-09-07 03:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45abf2134de74cad442e53705ac68203 SHA-1: f3b3698e778379380665786a4ea96f0e0cb50b92 SHA-256: 6b8988c2a3622150a1383e5e902ca9bf763f3be978172e987790c1315223ba14
184 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features numerous external URIs, including one pointing to a raw IP address, suggesting an attempt to redirect the user to a compromised or malicious site. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://paramountswimwear.com/userfiles/files/95817650107.pdf In PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/89d67d56865270691ea8d52781f1c423/53689384361.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/vofabazoxutal.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/bb42b057bd95b586362be3877ca3a4b7/xuvizamutulanimadezajin.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce24e001c9b---totagajomitazogefu.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/d5cc8913f3f249848e9e53fbc5d838fb/39472486526.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fe0fdff54236e83a73ec7ad0a0d180c9/32069025130.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/56101169175.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/konilevukibuv.pdfIn PDF document text
    • https://emprenderem.cl/files/52195794057.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/bazivopusifejezo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098e006daba2---vujunurowamofegojudani.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/970648d48eb335b9e8fb5411cb5d30da/vifusigodujinulimas.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210723070633_c26ife.pdfIn PDF document text
    • https://digiconelectronics.com/media/87695721723.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6840630db---18367893656.pdfPDF link annotation
    • http://agrobud.net/uploaded/file/22929842130.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210614175617102392s7oyci.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/64c6fca15f887a685722ed85ee8ce6de/fopazinekijowefep.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/75201391565.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/kukekuf.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/delom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=estados+financieros+de+nestle+2017+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_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 19480 bytes
SHA-256: d8cdd838df953add68e5609f4d2a076b75d37410f4882052cb1373416475867f
font_01_sfnt_off00012919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14130 10940 bytes
SHA-256: ccf74c962a420b2cbbdf55f9bc2629d586c27de967fb9f27389cdddbb756c2df

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