Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ec55caee38509b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 08:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d5d8ae30f454983f34840dae2b9a0f1 SHA-1: e549881e372e44448f71b28a4b50d001f47f72a8 SHA-256: 82ec55caee38509b403147a5a9ae46735b68fc11aab0628a4db8ef9c412413c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress upload directories or disposable hosting. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=watch+sultan+tamil+movie+online
    • https://dalycity.com/wysiwygfiles/file/94351765390.pdf
    • https://actsonics.com/uploads/files/202109040036032753.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32488520591.pdf
    • http://vietdubai.com/userfiles/file/48103138409.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16149a11217330---3788206860.pdf
    • https://cortemadera.com/wysiwygfiles/file/wezeta.pdf
    • http://lulanjina.net/upload/files/zanujuduribufilas.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614904a80153e---94686517767.pdf
    • https://bunianco.com/other_files/File/6544966723.pdf
    • http://www.ctnphrae.com/ckfinder/userfiles/files/mazupupowujepisuxigego.pdf
    • http://handsonmontessoripk.com/userfiles/files/75410505442.pdf
    • http://tonioloclaudio.it/userfiles/files/xumituvixaripoxijimovigi.pdf
    • http://globalbando.com/DATA/upload/files/202109140258569256.pdf
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/jasowebuxidokipofo.pdf
    • http://www.zywawiara.pl/pliki/65965291547.pdf
    • http://purepoem.com/resource/docContentImg/file/2021-09-02/4b45f47cb8639121b47342e50f89e490.pdf
    • http://autosoftware.company/autoresponders_images/files/nuditepif.pdf
    • http://chamdure.com/DATA/files/94965933729.pdf
    • https://marathonblainville.com/userfiles/files/zuvovapudofumutiwoxi.pdf
    • http://infrabud.eu/fckpliki/file/kidetaxesoluzax.pdf
    • http://basaritarim.net/admin/editor_resim/file/42303258228.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/689621885c1ca3feb9708471426176b2/bitolixuku.pdf
    • http://skncn.com/u/files/14466999968.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d449.bin
b52e12890f87d51dd18a1da2cd6c7a3a189322c5fb3f8a88f9024a3fa69e525b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD449 18004 bytes
font_01_sfnt_off00010304.bin
a5badea3ce1fa3a3b8e68b7917dbae7045a52b516024d6ad0a3f5cf4f220f002		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 10556 bytes
font_02_sfnt_off00011afe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 16792 bytes

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