Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac8afea356e4c45…

MALICIOUS

PDF

87.3 KB Created: 2021-06-29 19:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4556147b4e080bb2f2a86a956ff4843d SHA-1: 680ce60885da6bd73fe7b63eac91203ceffae608 SHA-256: cac8afea356e4c45248c16ed0c42d1ed5bbeafed734587be28c124dc0b29bb60
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://fotobolfestmeny.hu/mvc/userfiles/file/lesuvi.pdf
    • https://efnnma.org/files/file/26143184728.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9e1b52c41---97302221072.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd614fc1d---lugugelamekupolu.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884ee2221e8---15419730135.pdf
    • http://mousike.it/img_ins/files/vikozo.pdf
    • http://hongdacable.com/d/files/3779950277.pdf
    • http://alexdisinfestazioni.com/userfiles/files/wavalugota.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/2f1793fe986e768096ff944cd47fdea6/tonogovivirexemaragoma.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/df9f3a98858160dfcd79ff864ae0b888/66056472125.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ebjnpcbqujmal5n59ia48thtea/wikuxazejitelop.pdf
    • http://x04ydivan.ru/userfiles/file/lerijafaduredewusoredulug.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfcf21db7b---segemejugofaxakovaja.pdf
    • https://miet.hu/kepek/53354464795.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ebdb3fe9b---40165792783.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/99583341998.pdf
    • http://salon-urody-bellis.pl/images/file/kuvexikinogen.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903650667d1---bakupunukuwabajoladalese.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c13b7be7bd0---jodoguguzegibolejozup.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/39975384587.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/30oq8vv9m77su99soi77g8ig69/79022266258.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082e232dc9a5---kisutomolijijifo.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/7c5ccb71e1749493c5db6a510226cc24/tefugowadumumosukigujil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=kpop+ring+ding+dong
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f59a.bin
8f52635fb9f86e292917a609021d9f28d2ff96c0c8ea6a1fcc911a4963f4fb52
pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 17116 bytes
font_01_sfnt_off0001228e.bin
c26c10e413035a77c09f7029825943b49b0df2a0c0a7a4c62ada6b9062834983
pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 9952 bytes
font_02_sfnt_off00013853.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13853 16792 bytes