Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b4ca39ff3162ed…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 04:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4bcb9c93f7c7121d766b09f4e7041dce SHA-1: 9ea9449c44ca3b4960785f79203711bfcd8a381b SHA-256: 30b4ca39ff3162edef66a2aa5ca20b89fbc2491e00bdc9e2379929cb29e2caa9
196 Risk Score

Malware Insights

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

This PDF document employs a social-engineering tactic by luring the user to install a browser extension or update, a common method for credential theft or malware delivery. The document contains numerous external URLs, many hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution campaign. While no scripts were directly extracted, the presence of PDF-specific heuristics and the ML classifier's high confidence indicate malicious intent, likely involving exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://chcial.ru/uplcv?utm_term=clinical+pharmacology+textbook+pdf PDF link annotation
    • https://preciseenergygroup.com/media/dosiwupemofepupopanalul.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/dibijixalidikubidemutozu.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/wasenorazopilu.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/8204342548.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/79451497710.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/36540102048.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/da8a984439eef04f2752c828d69a357e/goxinev.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/51573311215.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/7159581186135f7ec36dbb.pdfIn PDF document text
    • http://anm-av.de/uploads/files/wiwurabit.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8969af07131814917f104f420de1097e/7899039923.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161369d9b259d5---73320119817.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/28515155876.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/fofiduroxofapufeziwij.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/dalegadumakun.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/8239065909.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/sawalutuwodunofut.pdfIn PDF document text
    • http://checopharma.com/upload/files/sifoweloremadumedu.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/zotemowanosupuwisogoni.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/gewatutawomowez.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/11599004989.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/94511331361.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/60875430163.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vfo1eho8fsiafd8ov46qca1pg2/dogowot.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/42181403781.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_off0000d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 11380 bytes
SHA-256: 52b99d93f576c35f0bbc6d3d02bcc79f429c47ece084588e8365044d08c9cd0f
font_02_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 18716 bytes
SHA-256: 64d1ffddad7843f7d9eb7dc9f76c46b1297bc06702365ab7e70a414e76351e4c

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