Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f94cc8bccfb772…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 09:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e097ed4e4503ae5fee22c27af50f19f4 SHA-1: 1badc0c3cd5bb1e00ca4dc0b70752742b6109ce1 SHA-256: c0f94cc8bccfb772719b7e35bd404e62714522c988646439ac02c55f279acd62
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and link farms pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=psychology+as+a+science+pdf PDF link annotation
    • https://betamachinery.sa/other_files/File/47036444742.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d82fc720d85f179bfc1cacb94e76596/24569040591.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/7d32a15a7beae6f430ab3bf271038609/jisusodixod.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/51077153866.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfc1b092df---35636910163.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/siwezojef.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/lalulebamatelurig.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/42204264547.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16078e17b4646e---gezekanujunudusolujegugu.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/94411268904.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/xenovovigijogurisijed.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/97970755069.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/16848777074.pdfIn PDF document text
    • http://araonline.hu/uploads/file/86144659317.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bf9adbac1---86722656315.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/didavejifarugibemi.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/fuborovujetore.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/juwizobaxuzi.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/70696954474.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/82452764992.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608409155735f---silib.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/mujevuzawinedir.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/79eb0a522055a3dd097ab8a99555a130/mesurugedeserunu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/d4957dcacdd6302e79080464ce26fe2b/jarakapemef.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a534ab34993---82937586319.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 10816 bytes
SHA-256: 5c3f0a4529c86819822e688f17fa428bd1278224bfa70954fda0fd16e0d1ff06
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 16880 bytes
SHA-256: e2855c83d54896b24fa53f6be253df0a681a87ee9719165965777794d6d959bd
font_02_sfnt_off0001214e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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