Malicious PDF — malware analysis report

Static analysis result for SHA-256 efeb44d80b498527…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 13:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 525c19e7a2dbe43ad5da3fb882f33f2b SHA-1: 5c0a09f0d794f905f0dbd0c0c02aee56e56be9ed SHA-256: efeb44d80b498527a1f32b8824cfbe8b6e77d65ab33c1fdf2ef1089d14bc98d8
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://professional-tuner.at/uploaded/file/fudogalawisuwikiwaravifi.pdf In PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/39275604527.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161242bf4e1e42---sumajoworiro.pdfIn PDF document text
    • http://gptools.net/userfiles/file/81373084584.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/2360860922.pdfIn PDF document text
    • https://togeltop.net/contents//files/butefo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3b30b4dd---palififevutak.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0430f7f855153ce9d7b93b9a114788d1/wawuxetenova.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/62147717045.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160789a9d99c45---44016839435.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/5vtaq2re56k07j52qquprfc0d3/nigab.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///torex.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/zidewefifobekivow.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d3a84f7a964585c0c28aafa72af966aa/16920538352.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/60151662441.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/14117660445.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/vulafezosoxawejupuvigugag.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0888add18---fejilanuwurosamam.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2bd76c4ee---18625262487.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/49574657130.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/vatutigibevarus.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e7bb84fc645d6227281118f7b6205ee7/98480687861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pregnancy+induced+hypertension+pdf+downloadPDF 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_off0000b9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B4 16736 bytes
SHA-256: 445a24d2b13513a09f0cb8778fcf8f93431c6823a9369b288950c5cd120e5080
font_01_sfnt_off0000e52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 11200 bytes
SHA-256: de8b172680dd81b58062cebfe2b31166b33a0c931eb2f78dd35819019190f504
font_02_sfnt_off0000ff39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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