Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7da665da3983aa1…

MALICIOUS

PDF

83.0 KB Created: 2021-06-26 20:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39022f0b4f107ba6916b74ad6f4c19df SHA-1: 97b671f367a4e538a53ca978915769b97490f2aa SHA-256: d7da665da3983aa161630c1786b87e58dd9172c758f7f05fe71239606a7af1f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to malicious websites. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload, likely delivered via spearphishing. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://drafthe.ru/uplcv?utm_term=pdf+convert+to+excel+free+download+full+version
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2d74a08a400662f2f05b022935a5b707/11979060091.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3fb817640ed9bd93a1dd1746008e8572/gevuf.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/2lp7ce1ccjirf109va97js83dn/bipile.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/308bdaadfa0f4f31bc8515ce5f50c52d/rovil.pdf
    • http://rolmech-strzelno.pl/Upload/file/genujuwavaper.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae570db54a0---31479589206.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/pj24219dkdofp8sq5vgujs9ka3/delukefutekoge.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/a1c04943993063962a78745df8d640c9/vifaxoxedosofefevog.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807e27975d9---fizosejawebegetodipawoza.pdf
    • https://netshopnepal.com/userfiles/file/9695146105.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859c8736721---wasudimoki.pdf
    • https://jagominum.com/contents//files/15074691553.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e5997a495f64c21ffc75ea1ac9da6522/vajogaxuvukaziruxevi.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160955742150b9---57090079163.pdf
    • https://amatnieks.com/pictures/image/10322103507.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/iabj84fb0adqdltj2drb540dqs/fofus.pdf
    • http://eakqshop.com/ckfinder/images_store/files/57063282410.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/74421793a4513ae5019f065a0ff671b6/pezozogurazu.pdf
    • http://jnnycc.org/userfiles/file/fubisavuxes.pdf
    • http://bartuceviri.com/userfiles/file/90335377205.pdf
    • http://maszyny.pl/userfiles/file/viwivafi.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ca386122fde46677b06af94cf78066bd/46861135134.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d076817c01---91369672107.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b39dc9b5---zenobanebip.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5fc571cad306fddddc77c60e84b813bf/mebunevuriranusename.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_off0000dac0.bin
c083a2f7e6d419722ccd5990aac3f1615a7ce8db5ef3334ea5bde549c379e690
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 18908 bytes
font_01_sfnt_off00010b4a.bin
75445b594841e81b64db53801375cdb0e161f9fa82c2f5ca0e99a1403b1d989b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 10824 bytes
font_02_sfnt_off00012480.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12480 16792 bytes