Malicious PDF — malware analysis report

Static analysis result for SHA-256 77114a55c28a2a7d…

MALICIOUS

PDF

70.3 KB Created: 2021-06-26 02:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c7506e95ede97f9309be700f4cc857d SHA-1: 33f272e040f543a39d0f5454fe343ee934d2aff1 SHA-256: 77114a55c28a2a7db9549019c2b180e8ba2c6263aceffa34cfa76415a165d947
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=sit+up+tracker
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d6342f36c0538a9774b7e039c2eec0ff/libanuxomitipid.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b66cf09ce14---57814570170.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/lv7qbi1stthr5p7oh9k02q18qu/tofimokoremizawekeso.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a94bd9969---61194757916.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081ae67d0d40---rukoli.pdf
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/24400144356.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01be500f7---74969855746.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2bade995747e46ecc9c18b0508a3a8fb/melot.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/be9961fbdf45f4023cb7e37ec89dd43f/rurunozafipinireg.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/90791637540.pdf
    • http://bukharaalpharetta.com/sites/default/files/file/suziwesukide.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d330271d4c---vozupeluvuvujazasulazaxi.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/tadosadoxupaje.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab8c8667f---bukojapusevuzug.pdf
    • http://animalscipublisher.com/files/upfiles/file/jezevolemowezenexapapilad.pdf
    • http://xiaohecollege.com/d/files/29434128693.pdf
    • http://bycongroup.com/UserFiles/file/3949135561.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607040622f70b---77455524688.pdf
    • https://electroagro.es/pub/files/gezuvu.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dfec33079---6185834570.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ccfdc8bf905de5c492eda70e3a66362b/zexidowojoxafe.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ae21316a5---95615888681.pdf
    • https://palezieux.com/ckfinder/userfiles/files/22834948898.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7ad6d883---84950050971.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_off0000b718.bin
84b1cdb3ba3e11a0771b8b9bfe72355325aba5023275e2a7a36535a7cc810a98
pdf-font-stream PDF embedded font (sfnt) at offset 0xB718 14968 bytes
font_01_sfnt_off0000dd2c.bin
91a418823d2d2fe0d567813b453a4a7d302201902eef5eacc71347fd14f1bdad
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 10196 bytes
font_02_sfnt_off0000f437.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 16792 bytes