Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80b74133f036e1a…

MALICIOUS

PDF

76.7 KB Created: 2021-09-12 03:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bba588fd53b30cc4aaf73b48bf142757 SHA-1: 03d2848990f95f06159bb132be44ea065155a516 SHA-256: b80b74133f036e1a4faa1a8c7a47e33bf225c0687521bdfe49a6cc82f1330a8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript indicates it may be used to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://veganogle.es/uploads/ckfinder/files/rizixepe.pdf In PDF document text
    • http://f-okinawa.com/img/tmp/files/11128017039.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/20783039946.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613834b544dd7---31566446647.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137be7454819---gifuvada.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/penog.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374674c3fdf---sirukasizudajikojo.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/90312507560.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210904192600.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109071819399414.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9a280588---57878538520.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/manuravavo.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/20054954146.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/86730946801.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/nezuwezo.pdfIn PDF document text
    • http://friulanapanini.com/images/file/luwadavi.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/wunode.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/7119415811.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131911daf3e6---36718202999.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/sonilubuvixeguwagolaj.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631285808.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/11882186127.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109021657116085.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/29958539364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=magic+the+gathering+apk+downloadPDF 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_off0000c4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C2 18260 bytes
SHA-256: bba23abb1f78486ef73901ad1fed7bef833f5009302d79ad5b39e1fa7e1f7aa4
font_01_sfnt_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 10796 bytes
SHA-256: ee0a300d491419389dda16da66e20aa99a0724d95552bbc0d26267912c982e7e
font_02_sfnt_off00010cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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