Malicious PDF — malware analysis report

Static analysis result for SHA-256 985fd50897f893a3…

MALICIOUS

PDF

85.0 KB Created: 2021-06-30 03:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60fc640d75a559c942d894875f98fd0e SHA-1: e8675380d8557fa6955c0391a8b49707dcef9e5b SHA-256: 985fd50897f893a397a33b6266f6e058da98d61b8e756b1ed66755fe72767a2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farms pointing to compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of multiple compromised links is sufficient evidence of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=best+open+world+car+driving+games+android
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6e06eb49---50102802386.pdf
    • https://sasalidayanisma.org/uploads/file/45925661520.pdf
    • http://grandchainfamilyfoundation.com/clients/85333/File/mobixarizazonapenavotas.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/7bbkjjsf6run95j6tp2rj08nof/49763200952.pdf
    • http://joyearland.com/ckfinder/userfiles/files/goledotifibosepunuxu.pdf
    • http://tokstar.com/_UploadFile/Images/file/583011374.pdf
    • https://asthasupermarket.com/userfiles/file/vonedenole.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d1cf74b21---milulazupaparodozibi.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d0023cd2---2515033035.pdf
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/20018372576.pdf
    • https://transport-vehicules.fr/userfiles/file/xopuxefujizutuzewajuji.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795619a5917---xojorenu.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ac160c92486732a4be374d8f383a69aa/nadisotokopiwirab.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160774d41b91df---62630023288.pdf
    • https://gtnet-engine.com/ckfinder/userfiles/files/1051561866.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/kbh36bfmisabukpfggr8fo4ufq/4982193099.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/rdopmbfqp8q0u4a4vsemb9qp3e/rujotozeselorap.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762f57944fd---fipadulubarubuvap.pdf
    • http://magendans.com/imagefiles/file/77963518978.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c0eb61211---40710628058.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ulrpnlm8dcoig79dq6eovb58kb/xedidapelusined.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072271b07828---wugibuteladizorilose.pdf
    • http://fw-simple.com/uploads/files/24041906160.pdf
    • 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_off0000e9ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 16792 bytes
font_01_sfnt_off000101e5.bin
25a9ba39d016066b7376a1512506d5fda1d85afef5a66fb2435a055a9eaa30ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 11060 bytes
font_02_sfnt_off00011b85.bin
6b687a6266491b6861cac76457c0d35d0891d5575b9cd7e266b9178e67153672
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 16648 bytes