Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4ebef141706cb2…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 17:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a8af483782bd5d32cb8d38849dc8658 SHA-1: 76ba200860290f560b97a3929a2e63bd19cd5ec1 SHA-256: 5d4ebef141706cb20263cd9778235cee801b188b1374e02e3cdec8498db9e036
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised or disposable domains. This pattern is commonly used to distribute phishing content or further-stage malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=beyblade+burst+dranzer+qr+code PDF link annotation
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/lokepak.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/bemoxoxodesajulexevo.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/60603838393.pdfIn PDF document text
    • https://ycb.one/pro_pic/files/xaguwareropudex.pdfIn PDF document text
    • http://espokebar.com/uploads/files/16553474535.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a2a5d9cd48d5aedd4284fa39d1df43f0/givawinovixewaxomoxem.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/49218254037.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/7451196430.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/lilominok.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/n1207ot5j7pg75i0dbbmaha745/zotugalixadetarerifunafis.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/42099565341.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/fugarowetet.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/60627494903.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c66f25c1f5---23383815440.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/32770013190.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/tozugisepopokejilelan.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210914_B895FFE662C62181.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/sasekibaxisofe.pdfIn PDF document text
    • https://umartravel.com/files/jesinopejurupesurepavajim.pdfIn PDF document text
    • http://gdgom.com/upload/file/210906012059116972gco5lsdt3flx.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/27134434653.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/35236115332.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/retojememon.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/96729221306.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/bobitarovewoge.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_off0000b34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34D 14552 bytes
SHA-256: 0a2c6b45de8725991fdfadac85d48e13e0d1d4f3e2cb77e4d382d122fc8bcc2b
font_01_sfnt_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 10884 bytes
SHA-256: f5776c2d959718eb9e9b65426f235f8ea332288c8fbaef1355062224cdff1d63
font_02_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1