Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84c44a5e7a7a0f5…

MALICIOUS

PDF

230.7 KB Created: 2021-07-07 08:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bd0fec7eaf7d9c0e47578141a5bb7d1f SHA-1: 935c4c28c81688fdb2c590e8270971eed458210e SHA-256: f84c44a5e7a7a0f58c57a8d5fa6380e84aeb8c5717333907f0e1204e5d7f76bd
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing a link farm and SEO redirector to direct users to a malicious PDF hosted on a compromised WordPress site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b97baa69e6---zowiluzar.pdf In PDF document text
    • http://prinsart.ro/uploads/files/51478420223.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6a9de95e805f7148d840a55876c6e410/zototazix.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940c8b5ec16---bivigaxudoxajaz.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0b793cd12df53d873d1974d1c1898efa/9252325040.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/f41923d966907dfe56a814186d6bea05/42477488312.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/058becb13bf060b6941e737c6384824b/xadujaximipebebe.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/kne9eqpo6tejs2hmkp2nkumhc5/gukebobigovuxibemewi.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/af3dd410cbf18d85fc4d792150e2a006/dutigowitopoziguk.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/20fc748af75da1ac0bec3cac9abe22bc/74347918911.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/e2j6iv2v0iiofjqdonmtgdvelf/gizowegalefexelotulewufo.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/pofovomifutetal.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/14513090346.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/mupoduweki.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/berifu.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/zebosigir.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/tawakexo.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/ruboxisogifurejumape.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/sigepete.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/77530216638.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2bedvherkptlc1g3f4vobm9s57/dabagivulojepewer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pushing+her+limits+sparrow+beckettPDF 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_off00032e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32E71 17284 bytes
SHA-256: d023de5b0d17f5b11d9fe35a2a4854bf61a6e5a7cd98d66af7d8d6d27f35537e
font_01_sfnt_off00035ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35AE1 11240 bytes
SHA-256: ac5415d941bc4754d51376af89df57a3666c67996ff358d62eb542c94650dcf3
font_02_sfnt_off000374e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x374E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1