Malicious PDF — malware analysis report

Static analysis result for SHA-256 37921d1728ec2ac0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 20:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8f5cbe1929fe79c7eb58c14bfbfc0ff SHA-1: 6eca3826828f3c9ae735ae78443084a580678c14 SHA-256: 37921d1728ec2ac06ca453259ad9c4328c5bc1f6de797a748e209ae4c091db0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://world-green-hope.com/uploads/files/rarenuzibimapiniwe.pdf In PDF document text
    • https://renewone.de/files/95548422450.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/83728351980.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/soruwogijibe.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/22800760342.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6456845ab---fobexugojex.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/jojikojuvozemenonaxufej.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/17060667955.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/061137079569.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/zuwafimimojir.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/vozexiku.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613176693c1d5---12670194119.pdfIn PDF document text
    • http://fitviewer.biz/files/file/36356957257.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/lubaxe.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161385ed8f3d3b---30656440427.pdfIn PDF document text
    • https://csodamalom.hu/files/files/refanoneredomaxob.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/pijivafoxij.pdfIn PDF document text
    • https://hoalavender.net/upload/files/wogigoreg.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/28213575800.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/vopesutozenozepazewepotug.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/zudewa.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/55338429837.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/wabogazabubogoso.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/fejudew.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/vadawazovufaxuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+increase+internet+speed+in+3g+phonePDF 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_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 10996 bytes
SHA-256: 3164d3e98f172cd405e1a0843458b9de29c4858acd7b593fa08d38038e10979a
font_02_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 17920 bytes
SHA-256: c79da1b12d42e5502aa341ae2569919b8e3c5ff68e44c183f68d5dd5fb88dc18

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