Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae72521a4f15fc04…

MALICIOUS

PDF

148.6 KB Created: 2021-07-13 22:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe469ba2379e89ffb82bff49ce6eea94 SHA-1: 81eeec41381e001142b3886a87905b0b8a606893 SHA-256: ae72521a4f15fc048f4ee69e40ca0ca8aa5ac792c0ebec50e03965fb7d1e7bb4
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body was unreadable, but the presence of multiple distinct hosts and the nature of the links point towards a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://queure.ru/uplcv?utm_term=app+that+deletes+double+pictures PDF link annotation
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad842363083---31524000326.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/9611922262.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4f3bfa0d95a8d6830ee118b190d8484f/91670991936.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cb12f24b6---37810203316.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb9524c7d---nefekejuvubakifexakofife.pdfIn PDF document text
    • http://seamacros.com/upload/file/wukajolife.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/75755849618.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160927e2fa443d---2180321145.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b73ad4b9ad1---sefibup.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/julujuxenafenivujama.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/gefodafiwabaxabifufiwa.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/4cc212af902405fa250fe46733d50568/rotezuvejidubunenel.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/56371333385.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4252a511d1---65515326427.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210627_114419.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6674d3bdf---jutapixulonubivagizej.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/kexixabukodefaxoxuzufug.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6fcb0unsluvljr7sh1uaiml194/dilavimabusu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d2faca970---wigovixaz.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160716aa2b8ae6---21055277271.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/22566be3b05df809f2a405fa4f636fe2/52833684749.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a24c34206ac16f41d30bac265034571c/34549063382.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/zarozikizebefunotaloze.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA5A 16756 bytes
SHA-256: bfdb0fd47a8c29b4079b598b7676de89f78972104caf323e7853b9aeab45697c
font_01_sfnt_off0001e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E16B 10728 bytes
SHA-256: 157ce487636870d5a7bd0e135d583eefdf201209c47ae74569d3408242b0e81d
font_02_sfnt_off0001fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA01 19064 bytes
SHA-256: 6ad2b77273fa87a9ca3f24417437978863759dd7568b70e28e77f570f6c719f6
font_03_sfnt_off00022c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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