Malicious PDF — malware analysis report

Static analysis result for SHA-256 62706acf19a77120…

MALICIOUS

PDF

71.3 KB Created: 2021-09-15 15:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4faa1ff694bfce2c3e743c5e2961092 SHA-1: d765bc4b87ef1923596983f9c6582d97cc3ffdf4 SHA-256: 62706acf19a7712027b8935b5d880257a56577fff615a081f8754f81bb60dc1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, including compromised CMS uploads, suggesting an attempt to redirect the user to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://inwebjor.ru/uplcv?utm_term=swords+and+sandals+free PDF link annotation
    • http://synowka.pl/galeria/file/dolewovifaliral.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/52312889469.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/lixafuku.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/fawuposotogefazadiboxo.pdfIn PDF document text
    • http://eternaseguros.net/files/files/67238184015.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/10382199248.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/8948aa53eb04817d87746ebfbab9d95e/xibeletawerexisiragibok.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/62891122675.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/numavudukuluzasikebudi.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/lodumike.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/1707413838.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/17892574149.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/56776685588.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/zexivuluwiz.pdfIn PDF document text
    • http://soles2walk.cz/data/file/83692346594.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed1545e163---62007798929.pdfIn PDF document text
    • http://wami.cc/data/files/85040671646.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/raretunefo.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/25177777214.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/tejenapemakagiviw.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135836f6b81c---venijazubupegakuvusununo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613befd25a13b---52879681669.pdfIn PDF document text
    • http://signauction.net/userfiles/file/lagutomokabiluvefako.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/gizetar.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/31710202736.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/rodonoduwajuni.pdfIn PDF document text
    • 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_off0000b80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80C 10316 bytes
SHA-256: 4b1040292c9e1e3128c49786b60e770ae833a7d1ecad96e97e3198538221d893
font_01_sfnt_off0000cf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF76 15884 bytes
SHA-256: 998ec664179da0e9d0176d8699db667b7d9d3bce3c7631937c37da8b5dad8099
font_02_sfnt_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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