Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79ef0d51636e687…

MALICIOUS

PDF

90.3 KB Created: 2021-09-10 22:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3e7c6649b5b8b82eacbc2469608e8a1 SHA-1: a84698be849afcf9cac0ed580009dbec28d0c2d4 SHA-256: c79ef0d51636e68758e78f48f39b64d148665df0d1a1cbd77512da1bde584daf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users. The numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, indicate a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://coretry.ru/uplcv?utm_term=five+days+a+week PDF link annotation
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/45127211307.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/16835865601.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/ferivujixaton.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/tidapat.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/94103251118.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210902_185121.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/93202498606.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/64587500627.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130008ecac5b---4947229953.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/vudozifinira.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/54886762421.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/41972895977.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/43872654374.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc8d02210---metuwibuwotedenavulo.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109090110163137.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/25795567872.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/zaxikadew.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/biriwixevudofo.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/jazujenuwuxoriwaloxi.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/suwire.pdfIn PDF document text
    • https://theurbanthinktank.com/files/70987134169.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7ee49ea2e1438f8d6f91866d365f1995/gosafovorib.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/sawitovip.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_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 17296 bytes
SHA-256: 43f86913a26bf876b7bfa23ebe45baa860618d385c4e46b5353c432eedab50a4
font_01_sfnt_off00012ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F7 10108 bytes
SHA-256: c3ef32bbf59b50241308af2d75838f11d6589dcebd8da1dc3755921719843bda

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