Malicious PDF — malware analysis report

Static analysis result for SHA-256 133c2fc82fe3c86e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 20:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 45e4a3266cd650c49c6db8d1b326e4bd SHA-1: 0741d1b71d1a163d018555c7b246045f124793be SHA-256: 133c2fc82fe3c86eb47f5f2380cca48afd55bf113375a8d004afd5e6155bad15
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious content. The presence of multiple external URIs and links to compromised CMS uploads suggests an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://synerhu.ru/uplcv?utm_term=differences+between+acids+and+bases+pdf PDF link annotation
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/l2a72s1b4t3584hd5sk84ku555/tutijodositalalinin.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/lufiw.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609902e2c8d95---nekinujumigo.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/82942563520.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fec54819bb---53148465667.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/53062921246.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/suvipaledujijujododugoj.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/luzisepezuxesuribowol.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50c2b993f---76472322064.pdfIn PDF document text
    • http://thaide.org/userfiles/file/jovufudit.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/okuu0v0b51s1dh5pj9hujquu27/19224356844.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56294dc9d1---mavat.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/30a01ac26bc3f875305b0e3c5f300a97/44532993679.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/ramirigujalipoga.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161003a7adf103---4850349861.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/34056035122.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/57789412429.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a73ab02163b---28511110366.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a2aae38a7214ce5e3d528793f51c3a64/soxebenujurujegub.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/22028802568.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/nuxidokixiwe.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210728_7D149D3B3B15B1BA.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a064a6a39a7---dopareleruradalesejanipez.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/hpmt9abia2nm6loa7f7co5n9sp/zapeloj.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16108df0042ac8---97504203238.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b523a641727---jidepego.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_off0000d57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 10676 bytes
SHA-256: 5c65fa8453ff6b9468d1db77492830ef9636f7886b14f73c9522eaf999c3e2ba
font_01_sfnt_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 18012 bytes
SHA-256: c782edc0c7d272e0890fd93beb686c1384a40faa62936fa59e2ea57b8a3e5e25
font_02_sfnt_off00011cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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