Malicious PDF — malware analysis report

Static analysis result for SHA-256 a177550e07fb128e…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 04:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ea258d4a7eb0f800978d74e1687f604 SHA-1: 1b6f08b2da49220e17fcff28ca058b4c9e222bae SHA-256: a177550e07fb128e03872386114b8af4b5df8477461aa2e6ceada97325c8951e
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=best+free+editing+apps+for+windows PDF link annotation
    • https://hinodecoder.com/userfiles/file/nugutixelokunukafami.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/zuwitelefewogafeka.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c33ea68af---30201769810.pdfIn PDF document text
    • http://perksys.com/userfiles/file/8010464897.pdfIn PDF document text
    • http://uhorder.com/upload/files/92450739827.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/muwijalimedapidunepun.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/kakofewaza.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/rebulo.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/78691341921.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/tamigupo.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f00be715---nezip.pdfIn PDF document text
    • http://kvrhousing.com/uploads/45264329327.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615114b386cbd---70908702323.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492bc562d2d---nepomalofine.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/fovexemowuvemiw.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/duvaxebufebuxapex.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/guzozisamazawuji.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/67630920338.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/84310496499.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/62346932130.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/71326308404.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/nibesadozeruranosojuteve.pdfIn PDF document text
    • http://cartopack.be/Images/file/85050398463.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/xamewujokasorevowari.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/jekuxifejerufutuderere.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_off0000b15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15B 15612 bytes
SHA-256: 0b3674c990ee78d02a0dedffff01b0f459a9e8cd47e83f4222b61885e5980568
font_01_sfnt_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 10768 bytes
SHA-256: 53406a639aa90075fd3a089b1f5a62f8cc539a6a679923f0303cc8c1824e20a9
font_02_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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