Malicious PDF — malware analysis report

Static analysis result for SHA-256 f020acb3e7f625a5…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 15:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16670592b5d22dd9a468ae8abaf2ae3f SHA-1: 21772587e1b93618300f9a6f38098de85400e67d SHA-256: f020acb3e7f625a546ef612c330762415bd1567fb4f2b0bba3cac1aac9328529
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=cheat+mini+militia+mod+apk
    • http://dealershop.es/camarasegovia/userfiles/file/jokipoxoz.pdf
    • https://propactionvehiclesuk.tv/userfiles/files/40300293127.pdf
    • http://www.egymast-segito.hu/uploaded/fck/file/47086776190.pdf
    • http://agama-rc.com/upload/files/18628002990.pdf
    • http://uralcomservis.ru/crn_fls/crn_files/95937657301.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f586df15b---vonokebikagorasimasa.pdf
    • http://pro-customer.de/userfiles/file/64446497060.pdf
    • https://groupunsur3.com/contents/files/bebaku.pdf
    • http://a1climbing.com/userfiles/files/5056179073.pdf
    • http://lapawan15.com/shop/fck_file/file/41429741077.pdf
    • http://turskazka.ru/ckfinder/userfiles/files/65138311604.pdf
    • https://manpowernepal.net/ckfinder/userfiles/files/31888406159.pdf
    • https://akvaguru.hu/user/file/zufizagutexavavufame.pdf
    • http://igabana.com/upfolder/e/files/20210914065623.pdf
    • http://cafesezony.ru/fck_editor_files/files/dukaluwa.pdf
    • http://photonart.nl/phpcmsys/file/25916082729.pdf
    • https://avukatwebsitesi.trakyasoft.com/upload/files/31364701802.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc81ea15a---ziletagokon.pdf
    • http://chip-chup.hu/upload/file/30608649419.pdf
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/54579630485.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f2842229---84619655338.pdf
    • http://nbmounts.com/userfiles/file/1630721152.pdf
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/kedenogelu.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_off0000b8d4.bin
c8bddf1ccb886a9133e8fa2c600f13d407d3e1f72eb0df6ad1b2cc1741a1b1a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D4 10512 bytes
font_01_sfnt_off0000d081.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD081 16792 bytes
font_02_sfnt_off0000e893.bin
a3af69aa356b92b547cbba51eb34c9f4d89b635387daca0b2b8cfa11d8532658		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 16372 bytes

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