Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b2adf232453bb3…

MALICIOUS

PDF

86.8 KB Created: 2021-08-12 09:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46dc4475ad24bbbf1a764a260287fb28 SHA-1: 64d1b7581680b90cac209ef1fc56bd3ae2e4bcd6 SHA-256: 54b2adf232453bb38fe57996dfbd821d40a63898f37b1a7e1a89e60b2cb89e41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links indicate a likely spearphishing attachment, aiming to trick users into visiting these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9816

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=descargar+el+libro+150+formas+de+iniciar+una+conversacion+pdf PDF link annotation
    • http://kaztelcom.kz/ckfinder/userfiles/files/gazedenuwogekasud.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/42301962609.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb841949e8---12538531376.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/g7lfqit3sgkd164nrhmbhimo46/65756226190.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/2294823b1914bc8869561425bc60ae0d/terigofaf.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885b5a49c88---64611384386.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/92986691658.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac109f36f63---40400411244.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8d5c45db8ce55a8fd3529d5b66b5c541/mavedafolafezigurebafijof.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/pasalemizexuwon.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/lomorotiterulitulode.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ada93904a---jiwesenagitobu.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/fonopito.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/juwubo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ac785909---balamejaxakuz.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/8047916.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/57465905986.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/rhdcosjvtjjhc0oue0ol40g56m/vulidutubeja.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdda269b79---8509474898.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/047f58d0eaca95946ee4b921e67322d3/37342942792.pdfIn PDF document text
    • http://revtechnik.cz/userfiles/file/22581338760.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/64ae758663f7d566c34d6f14849485d7/56485090929.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfafb4b9f88---vaxogowozezokejopariwalet.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/134ev895tv43koev648bb5gs5n/buwukixafedova.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/vugazekapepigobisuzirogi.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/7283297e55c7757680faf5dadd2f37b5/17608616223.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000fadb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFADB 19724 bytes
SHA-256: 5ce56bfe09ede11249a16b47e4a5de3cb1ba51ae11b2fa853788b2bcea4eb55a
font_00_sfnt_off0000c7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 11480 bytes
SHA-256: f55112f38ecbe6e7bf76b05d89cf586fabb478b1ead0e14396381f636833fc80
font_03_sfnt_off00011bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB1 18844 bytes
SHA-256: 9c2027ca03049d8cee953617def1df779a3a5e8bb5e34c2f1494863b91c3d161

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