Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa84c55e239fc7b0…

MALICIOUS

PDF

555.2 KB Created: 2021-12-30 23:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-07
MD5: 642a5da204461ff0c9d7f71318b47000 SHA-1: 8d462dce2f0cd411d598cf4e958c0ec4fd31d3d9 SHA-256: aa84c55e239fc7b0711e7f4166571bc36aa98b4b7390af8632541bc2f903f5cc
136 Risk Score

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4690

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://larsonsvanservice.com/nbloom/fckuploads/file/nizoguvepetoxuvapit.pdf In PDF document text
    • https://kamwalibais.com/userfiles/file/nunezixa.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/fudunarirudaxubul.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/gifijasiwudomazukudaxup.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/fofolojefe.pdfIn PDF document text
    • http://nensi.si/upload/file/bejavorodulelotewogamon.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617f43ec29a9b---75229660711.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1617340af2e93c---94678740871.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20211028065614.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/44410666114.pdfIn PDF document text
    • http://www.polni.si/Images/files/wuvono.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///60098281479.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/72534083174.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16168432d581c4---23505593668.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/jitomavafebibu.pdfIn PDF document text
    • http://dhf-china.com/d/files/9977641702.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1619a49ac394ee---kumasenari.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/92157930275.pdfIn PDF document text
    • https://baptistfriends.org/media/79571775665.pdfIn PDF document text
    • https://rayvoltbike.tw/geektic/files/ronivo.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/podetugedilir.pdfIn PDF document text
    • http://effekt-film.de/files/file/zaxedolimofit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/xPAns0MRe5M/uplcv?utm_term=dispute+resolution+agreement+templatePDF 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_off000839d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x839D1 16416 bytes
SHA-256: cfa2c3fbce80cc5607e01af033b793d17c57c214fb1d96e845eedea48cccd336
font_01_sfnt_off00085075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85075 10696 bytes
SHA-256: e09b1293b1b94f84562b24390c2f605b5a05bb65723254096da50f523686f199
font_02_sfnt_off000868fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x868FA 20368 bytes
SHA-256: dda5c55d96c288c169ab76801fcf9724360cb72d9cd4edd721a94c4e7616959e