Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2d6b77d117a732…

MALICIOUS

PDF

76.5 KB Created: 2021-07-13 20:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c6ef7c058b4a1f65c58d731b276f709e SHA-1: d851d72fee4ecc32238cdcd520ea1bdbbb66fc4c SHA-256: 1b2d6b77d117a732f87f5c0a2d9878fd117fbce91755ef67ab2c89bf9469e81d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is a link farm on disposable hosting, and the presence of 'utm_term' in some URLs suggests a potential SEO-based lure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 5

  • 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://catamma.ru/uplcv?utm_term=pdf+for+image+processing PDF link annotation
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/67d46825179cec2aac280648f7822a0f/14250050690.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/40362535736.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/wazumo.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/52947347190.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/640eboc8n2tga6vgnokesme577/navelirugiz.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3da8b845b---foratidesosifikite.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/bavozotixale.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/69403226625.pdfIn PDF document text
    • http://land89.com/ckupload/files/64907245322.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac44bd61da5---gelogomamewozivulojurawak.pdfIn PDF document text
    • http://sdds.be/userfiles/file/tafiwowuraxoputodubig.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e391fe2a5b8040fe2dd9a0f8932cf29f/tetaxerodupipeki.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e8aadec9c---44756965584.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160965fa14328a---bebanonodefojivodupasow.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b3bd474af---94845488657.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16080ca2f8e459---23651287883.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/5057fde792dedab18a456ca822b0a54c/88565474475.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/a688831baaadda3f41819c73de336ed2/97883376572.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/48dvh7qofkf3m9s8rl8n5nvvd5/zamuvonesesodevidunixom.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430091408192107.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/5b0de01e5c89e301eff43d168e3c6776/wedelato.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/rigexugaka.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/58kfqhemi5qll8f3kcsootn2s5/zevawafiwisakubu.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/nitaguz.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/be00a685dce8531a927d4e782e72b1a2/72353783704.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_off0000c8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 10820 bytes
SHA-256: 68a3a732469f5a6ced4c086e62c7438b9f9a4cbfb780dea6511bcf24165bc43a
font_02_sfnt_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 16608 bytes
SHA-256: be9cbfed32a558334840b2f4b6823b2d36a28b521bb925cf382b8e322b58e9bc