Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7641662259856d4…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 09:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e43a836d22dd65eb4d31ee8dea7dbd50 SHA-1: e871396ef3fabc8a7096b894c46bff21c24bb78d SHA-256: e7641662259856d4be48c12b1869f7c5a31ea3980953470311c324a05a84f0f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of a 'download' button lure and the ML classifier's high confidence score further indicate malicious intent. The file is detected by ClamAV as a phishing trojan, reinforcing the assessment that it is designed to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=indusind+bank+rtgs+form+fillable+pdf PDF link annotation
    • https://aawyx.com/sites/default/imageuser/file/13941181751.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11d5279f4b---43656875268.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/pawujaripogazewafewu.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/70309680342.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9719118c7d41748fdcdcdf0429134292/putiladenebo.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/suzowijirulefanixe.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612e1ba934b20---51633965133.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/dulifakaxafexufobas.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c4c78c3bf2efa27c2221336b9fe5eafb/71882723.pdfIn PDF document text
    • http://futboltotal.net/images/files/fetir.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/juvazobutukaxufore.pdfIn PDF document text
    • https://shidoremicrosys.com/media/fevekabijaf.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/jizegatibifijitusodunukof.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/56063994795.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/53089d4f70e10e459e9b42be1ec14ea1/nujedelam.pdfIn PDF document text
    • https://arerp.kr/data/file///61589127655.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/da90248710e151a6104af9806f8f7ef7/33057290198.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a436854b71d---xuvuniputisuje.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/ca7a8d587edc16e1fdcfcf1e1e123167/40492860840.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d2b5e70eb45909991bdd3e8a4a3e4f58/44217859594.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/gotipitotenotuzot.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/kjbuhcgh4ivramnet9egrtv3o5/96780352765.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/botukidevi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b4ce07121d12357395b2e52e6cf1e563/zexifiworozewot.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/36680072579.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_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 11124 bytes
SHA-256: dc321cb8117098bff94b3027ef783b4fd7672a401b5e183935eb768a5b5423b0
font_01_sfnt_off0000f7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 18252 bytes
SHA-256: 2f9bb0a96d0bbdf7c4451808686e707cb7cbc10246af1e18fc8cb94fec8487b5
font_02_sfnt_off0001275a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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