Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4db0cd082c1f403…

MALICIOUS

PDF

75.8 KB Created: 2021-09-18 17:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56124639cdaef2aceba6931c7c97dbbb SHA-1: c9a5da9e31e94643edd1e0273d28bba9d37a7e7b SHA-256: d4db0cd082c1f403dc803a8d95f78eb386aed0273a2fa593e706c202d61a0e77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous embedded URLs were found, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and the link farm detection further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=among+us+hack+always+imposter+apk PDF link annotation
    • https://pediatricpotentialsnj.com/PP/PPpng/files/8002702954.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613203b720154---16642388373.pdfIn PDF document text
    • http://apple888.vn/luutru/files/13293535854.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/kemavesirekedujirowudunip.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/vatutetudozosibik.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/69522178833.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/39645989451.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/30936323121.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/49572100196.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/ripaxipe.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/21904412072.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/nekefovifak.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/5855305418.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161318945f2f41---tarugazutupalodefoterol.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/12371844436.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/8ae2f2ced3389ff682cd8baaac20bd7b/nobewizado.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcb6af4140---fokipe.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/24986787211.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/rifufonefav.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360fafd026b---nanujibabi.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/lugexa.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210907185329.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/ranudadirog.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5pu536akolc9nv131vju4n645a/79169212712.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_off0000c3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 11192 bytes
SHA-256: 25d9e4e1f510567baf66f4f5d1f95e6a489efe70699a46f07bd365de1661ac4f
font_02_sfnt_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 17040 bytes
SHA-256: ada965240fcf4fc9f7db27d0adf5b573c71454489e9d305a8f645b0eef2d3442

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