Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44fbb29e6644faf…

MALICIOUS

PDF

74.7 KB Created: 2021-09-15 15:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 119ebb6aa2972433a8d5441f528b7066 SHA-1: 9a99af1f4a778013cee8d4ef28ed681ad3e7533b SHA-256: a44fbb29e6644faf415254523cae4c2d5414ed7fb17c56bc8c6c0f13447a6f91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and a large number of external links, many of which are hosted on compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=hack+pokemon+go+android+2021 PDF link annotation
    • http://tourhong.com/FileData/ckfinder/files/20210912_DAF1C777A9FB94A2.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/witupox.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161396f775e5f0---sememivurukuzovod.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/11358651307.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/kipabor.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/72909486840.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52930203263.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/zutubifufuveba.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210907080520.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137eca891deb---73922552515.pdfIn PDF document text
    • https://slide-bearing.com/d/files/xufibakupug.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6e4b208c---tikupu.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/xelemenijesezumabamogo.pdfIn PDF document text
    • https://tcremich.lu/files/files/63877533382.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135e76da3d58---90081870109.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/kobasipote.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/32857110160.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/borirebekikuvewen.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/69051365462.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/20306783021.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/lovefadejedujarekadanakan.pdfIn PDF document text
    • http://xhzhengli.com/upload/67046563191.pdfIn PDF document text
    • http://labotinnghia.com/img/files/23719210555.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/11656084438.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_off0000bdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC1 17976 bytes
SHA-256: 87749d2b7bec48b76e29689744f753933d4e899588b3a6fd6f303cfd8811ed8e
font_01_sfnt_off0000ec58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 10924 bytes
SHA-256: 695b3ad9a98d3bbdc0fe520739c05ce59dfafdb42463b527188bdc758e0d4516
font_02_sfnt_off0001056c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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