Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc750db8dcf8cf93…

MALICIOUS

PDF

85.3 KB Created: 2021-10-20 02:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 34aaeffbacddee2ad6cee96d558f752f SHA-1: 53359b1de2e8d3fabf2b5792b7e055e48d8ed697 SHA-256: cc750db8dcf8cf930e146090e99e29c70e3a0f4d190d69f3d7fe511344192ac5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=how+many+molecules+in+1+mole+of+h2o2 PDF link annotation
    • http://onlineticketreview.com/images/file/6416701183.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/66071558750.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/jezexizemawukuwusuzemojuj.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/76381316127.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/weruwofugo.pdfIn PDF document text
    • https://ebooksweb.net/files/file/tafudafolul.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/99039356662.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/xiwebutadavilozipepebaz.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210926010100.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/gidir.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/gowukilogixefume.pdfIn PDF document text
    • http://labonscafe.com/userfiles/kosuwixudemifezerenezam.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/zadamodemirowopukusu.pdfIn PDF document text
    • https://blogsma.com/files/lawabejutajubasigo.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/2oh1gu01l7sl1hdmsdat1squa0/78447738250.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/69798322581.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20211001110931.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/252756348.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80070497652.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/dfcec5c9124b97089dc2aadb62a54f1a/lolumub.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16163fb84244cc---15232574546.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/25752711248.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/juwemanudebojuj.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/lozamofatuvakadoxenokoku.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/gikinuzefosupumi.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_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 19268 bytes
SHA-256: 9d94486adf91619d4ff960d355879d52f48cdb3613dcba5d8de2420df1a85130
font_01_sfnt_off0001161d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E34 10864 bytes
SHA-256: a9f9769b341dfb28109fa8c31c5a8dc7724617cfd21cf48925dd5c8eaeb43ab1

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