Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cac1838a415b37…

MALICIOUS

PDF

71.7 KB Created: 2021-09-28 09:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7591ccec5b6fb1bcb750ff0c28593e86 SHA-1: 756b12deb0bc28dc740a415fd5dd6d0ae5604215 SHA-256: 51cac1838a415b375180e87368c34ad993a8983c0da4e85f0525a8a4dc998741
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, potentially leveraging JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://dulichtantai.com/files/uploaded/files/rebolijeboma.pdf In PDF document text
    • https://taperagi.com/contents/files/93904550893.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/wizapopepamovub.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/rapamuvejivofoxabusivega.pdfIn PDF document text
    • http://enricobarraco.com/files/99826591947.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/25306362411.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/zivokilojone.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/4cd9db01447b281594af3ae0db39c4e7/nevaluwafetemila.pdfIn PDF document text
    • http://klemanpince.hu/files/file/bovixewowudewo.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/7f198e4d53ff28d91f28181fed4c2041/nuxalivopuziw.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/35418409944.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/surisobugefegu.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/buduferiforidezibarotoguw.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/37294319530.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/57381523358.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/75483541194.pdfIn PDF document text
    • http://sql110.com/pic/76687304590.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c81cd39a0.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/37188216789.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/jukudunitedu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145cec03347c---18070597871.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/51192965778.pdfIn PDF document text
    • http://bamor.org/userfiles/file/26412390949.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/37448220433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=filmorago+apk+download+without+watermarkPDF link annotation
    • 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_off0000b48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48C 10924 bytes
SHA-256: c7835ba315d8b3008c9a586edcf2f13eb99b3f69db51a812eb2674bed7fe6814
font_01_sfnt_off0000cd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6D 17016 bytes
SHA-256: a60f5c8023e9816e42bcfc39604c55eaad959be027cfcd75dbed09ac8f40c9a7
font_02_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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