Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d956372d6aa4a0d…

MALICIOUS

PDF

75.6 KB Created: 2021-09-08 14:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7148e1191e989996d761b04098580ac SHA-1: ba06c37bdac95047fb49dbcfaf5cde1bc09e7a5c SHA-256: 5d956372d6aa4a0d2078f350cb853a5d5f0400975e58953b45036993d978d99f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pixomot.ru/uplcv?utm_term=buku+agama+islam+kelas+12+erlangga+pdf PDF link annotation
    • http://heathrowairporttaxi.website/userfiles/file/rasafabexememuvitisavusa.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/fojedapotonopanexo.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/sosojikow.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/72848233781.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/15248181597.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/71754538431.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/powuruxabovo.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ebfbd3933---13130107874.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/76839468785.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/24184640748.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/zunonujatefavagibib.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/mufugifi.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/31226692527.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210907084916911307482.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ebabb1ff5---82957539563.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/29344411092.pdfIn PDF document text
    • https://tsegypt.com/file/8321787177.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/7397085087.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/96476301914.pdfIn PDF document text
    • http://regmac.net/userfiles/files/selisevuxukexoxavize.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/81502877312.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/paxavomovopobuwa.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/33059761267.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137873fe906f---materakasotolefaf.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/3056497532.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/92714681691.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_off0000c2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BD 11040 bytes
SHA-256: 9991997911cffb5769b450523d7ebed6c52dd50b816613d3a51a717d51850c73
font_01_sfnt_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 16960 bytes
SHA-256: f6a804f5437e4873116fb408c4fa3920a440ad3ea150475c878c6c4966029b5a