Malicious PDF — malware analysis report

Static analysis result for SHA-256 496419b244b85ee5…

MALICIOUS

PDF

84.3 KB Created: 2021-08-09 13:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc082e4d577b04695b8c46094427a4f4 SHA-1: 5a1cacbdf9cb3854c5de2ea2721ba74a151bf9f5 SHA-256: 496419b244b85ee5f053481fcbbbe6093db2c505dec5797e1d4b18a1fe7db0d8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fupadukik.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/fufememakuwexozo.pdf
    • http://asokmontridental.com/userfiles/file/36488912846.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/oedjd20fnq3sghtocl8phh9mjg/73485604134.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b34cb6766f---85668481368.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7b9baaf2a72860cd5a804b9ddfc3118d/69662874149.pdf
    • https://aprilboya.com/userfiles/file/setuwuris.pdf
    • https://machnhaduong.com/images/uploads/files/rugotaworijum.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/rg2vs6rl3kglq9fo175911lcb2/buzobisubis.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd67cd20b---65828337280.pdf
    • https://mangonebike.com/uploads/file/36631062520.pdf
    • https://locktactyuma.com/userfiles/file/linusezimagofeb.pdf
    • http://dzstock.com/Upfiles/file/jepegafepofojo.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210727_8916D967F2159980.pdf
    • https://summit-christian-academy.net/scauserfiles/files/veluvixugogobolanezigup.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/34e00275c49c0cbdf54aa7d0bfd4dba1/sodasop.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8472e6b68---8631013910.pdf
    • http://indecomavo.pl/inc/3881227494.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096c60504f11---kujatijixixa.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcb4c6441a---34934026463.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/fb0ba997a866f1d0f9f80e5127362abf/12822704795.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/wutezekegusezudapunopogo.pdf
    • http://jfe.hk/userfiles/24227581833.pdf
    • http://teplolux72.ru/upload/file/46615538154.pdf
    • https://detector-billetes.com/Imagenes/file/gorivagevuvexirika.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=balancing+chemical+equations+algebraically
    • 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_off0000e40e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE40E 16792 bytes
font_01_sfnt_off0000fc20.bin
2648fc0b7521b90886bc3ba17eefa7e6126b15edad5ef531107852cdbed64d04
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 17340 bytes
font_02_sfnt_off0001294d.bin
273fb832453bfe7d7ad346863647e95e81e50356837c915f59f5274bca816cde
pdf-font-stream PDF embedded font (sfnt) at offset 0x1294D 11232 bytes