Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0eab54c8b5ef08…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 15:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ed413a3e686dcd7b0939d9086fa67120 SHA-1: 6ee7c49823f580ef2d73809355596261d2e24392 SHA-256: 2d0eab54c8b5ef08f7e1352b552fa49e5719337f437d8142faab6cf358c81a4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests the document's primary purpose is to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=zuperrr+keju+boboiboy+galaxy PDF link annotation
    • https://simpangkanan.com/contents/files/dununuwefunuxiseduwirejuj.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/57758144329.pdfIn PDF document text
    • http://henca.com/files/details/file/18614078928.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7e88359c195f350a3cbc093926b2381e/fenixivebigokeruvalo.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/mepojifa.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138c57e8dbd2---gipazovuxugafemunenanozob.pdfIn PDF document text
    • https://aayams.com/userfiles/file/jokezojemizubemujawifawa.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0888c4595a11d8a01982f868d1e29ea3/48426004859.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/1316898059.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/dolosulekados.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/sorebo.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/97924382514.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210911_121139.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/46944477027.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/kawijamukogamuzexidizow.pdfIn PDF document text
    • https://kildevangen.dk/files/sakumerodulit.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/mebejevika.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/mawurefudego.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/mapag.pdfIn PDF document text
    • http://cortabellanews.com/userimages/nigaziju.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/b4dmdsh3fs50rehi84sbb7cnkb/70737427960.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/10281289480.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613260cb83b9b---81838593507.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/dunarizotuwok.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_off0000c7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C8 17444 bytes
SHA-256: 5a1c91c24a6618af707c21dc4860b8ca5c1e89fe50394f149ff51eb2f231f088
font_01_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 10696 bytes
SHA-256: 8bd75ae88a53e3f9100f6cfbe15430389d241b12c6e38d3d24f3ec4b815bf696
font_02_sfnt_off00010dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1