Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c8c72d08a2de84…

MALICIOUS

PDF

83.9 KB Created: 2021-07-29 18:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 618153d8b1b8c9aa4fada701bc7abc01 SHA-1: 5c4446acd7b74591f98a046f9286ec2bfbca9534 SHA-256: 72c8c72d08a2de844204ca5b86d1c6346aebd745e76ed1da4abf9f42ce9c6dc0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The primary function appears to be redirecting users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infrive.ru/uplcv?utm_term=what+is+a+hook+and+a+bridge+in+an+essay PDF link annotation
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874fcf9c18c---35323675446.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/41380609952.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/tmfhhse7dl8dujldiso1u17kta/doroxawokobesusikebeseba.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/diwujixonu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/kidaxuturexe.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4983246aa---ditakinurogiz.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/93254531655.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/bipazizifetujawemug.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/rg707jb6i1otpruk7rdp7p0mgt/fuvajuge.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/77586d3a53d807a8606d5ff228c715c1/9279363151.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/13708477590.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/79537325037.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/24d6dd974675f04bf974814460d702e9/38690121008.pdfIn PDF document text
    • https://signika.pl/Upload/file/28271317792.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qj0tu7ubcsbs6gbv4c92ldjvia/76709244004.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a99c0c335490ff064e3a493201e75043/zojekiromatib.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/kefuxolegunekagizevitux.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed6c22b13---63266561608.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b018986fe---65100428075.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/kekaxirukupik.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/70148642004.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/59228717114.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_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE08 10820 bytes
SHA-256: 982ca6dc66f0535651283a9ba7dfa3b91d0c4ba6a782deb6f6d529e9b391a960
font_02_sfnt_off000116c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C8 16856 bytes
SHA-256: 3438b515c32461095bc48285000a9ed337b393c6f7b6e834389b98a4de6a2a31

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