Malicious PDF — malware analysis report

Static analysis result for SHA-256 05593c4229d7816b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 21:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e821d01c3f3573223d19362163736e01 SHA-1: 7c04ed24319aa3a49013a35afe902c0432334b58 SHA-256: 05593c4229d7816b1353bc678ba7e656c772571fa415fffcdb1be0a2be846a89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used for SEO manipulation or to distribute further malicious content. The presence of external URIs and the link farm nature strongly suggest a phishing or content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=farmacologia+ansioliticos+e+hipnoticos+pdf PDF link annotation
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b313fe79158---37543270348.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/u7jagith0soramc6n1faiedc7c/46146285944.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21384504697.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608020f992bee---guginapakotes.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/88358250145.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/55u7hiu6743m7qdapaktth70t5/senaxap.pdfIn PDF document text
    • http://texmet.pl/userimages/file/masut.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/15903704613.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/nelosimalefovejigizisax.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/59020147687.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/va2f2q9p1emeif332h5c94vd45/46477274411.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/34300190913.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/27732337343.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c47f7cd035b---powivedimev.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d2287f82f---befanimavizafos.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/firadowevipuwukili.pdfIn PDF document text
    • http://iccarrentals.com/files/file/93079039348.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/11962023460.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a7c19c636---fepije.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/97700766110.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/molofipabiniwokomase.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/93081317526.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/wexutimu.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/95456648206.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160887d552aa29---98326788986.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/78141884996.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_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 19936 bytes
SHA-256: 9321ddbb046096cd0255bdbbc22557c829b599af5990d02bc6d9a4a8c95114c8
font_01_sfnt_off00010e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001262d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262D 11044 bytes
SHA-256: 21f48529238543198f5835ae861a38c0323375dc78e4b79ad481945d928b0483

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