Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b14cde48485286f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-14 10:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a7293bae2978a6031a5410e1135a902e SHA-1: c43bbb5d7defe8700f791160b068afab79b9cd8b SHA-256: 1b14cde48485286f10cb61e0b18fae3d44df8f647e98ef5ec58c20598fa8d9d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to PDF files hosted on various domains. Several heuristics indicate that these links form a link farm, with some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://cameralehiep.com/hinhanh_fckeditor/file/52210520482.pdf In PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/susifufetegupunatonaru.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/megegizidixigiguj.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132af38c249c---7661866908.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/faluja.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630584417.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/36693160993.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/68261185764.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/xizidipojikabisofuxog.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/piduwixejogavunutamaxeka.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134731a4a330---nowebavud.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/vorizozor.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/kikodebadizuden.pdfIn PDF document text
    • http://cpviettin.com/upload/files/kosij.pdfIn PDF document text
    • https://tch.lu/files/files/wufejabuleketevak.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/46105349534.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/feziwuzapor.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d9e427beb0e1d21a9f276d21ed4079a8/zopinizaf.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/getedesagafisujap.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/renivuturabadi.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/92232049441.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/21116349472.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9c87c0560---welitibumapiwimufowisine.pdfIn PDF document text
    • http://nemochem.cn/upload/files/zimubo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea05fe0276---69294558151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mlbb+ios+downloadPDF link annotation
    • 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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 10132 bytes
SHA-256: 856c02c36186c7fab24aefddd88c8cf1c344a52635c833faeee418a0ed583ecb
font_01_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 17516 bytes
SHA-256: c460cab43b97751c6add349206e73711e0533ede82c388383aa369512e3e8495

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