Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df117b95f5da38e…

MALICIOUS

PDF

90.4 KB Created: 2021-10-08 11:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06506423ec3f5447cf05660326f0f5ab SHA-1: 16cf3155fdda9a9317efed4f3a00f7c70ab8f5cb SHA-256: 4df117b95f5da38ef5eff7b989140d60a5b41d92781bfdc7ac845560b775335f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://jgranit.pl/userfiles/file/16459713895.pdf In PDF document text
    • https://farmaciasacoor.com/site/upload/file/10053311839.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/57067416820.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/25598897337.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161531f007b171---tibiposizojonobijanutozaw.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/78141795075.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/dawolasikidu.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/60224453008.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ec31ca501---dudijogotoruwixusa.pdfIn PDF document text
    • http://entrackintl.com/uploads/91866593846.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/dizexozugalatewasow.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/29133381412.pdfIn PDF document text
    • http://calisnt.com/uploads/files/malujegudezinot.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/8223796164.pdfIn PDF document text
    • http://telektrans.hu/editor_up/39130974901.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/43329418206.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/sojezavumunolop.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ab2e1f38ae---54069859367.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/wabaxafokafeluk.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/werojer.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614473593609d---3796440289.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/74544264323.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/13862713683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=is+sugar+an+element+compound+or+mixturePDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/83668518227.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_off0000f5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AC 11008 bytes
SHA-256: eb022a26f6410d68bd1771a90510013a877d271d646b1b424b7f0eb7d5f278d2
font_01_sfnt_off00010f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 20360 bytes
SHA-256: f388c626e6051fae17297b9a85956b1ea8f97c4fcdfdfff936919b1d18d7af89
font_02_sfnt_off00014377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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