Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4f178e122cb7c3…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 03:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3bfe7c6ea5bc31ec9b68a2e3963ea2e SHA-1: 47c030b215b31f6c900b0dc35addc108d9eb04b7 SHA-256: 3c4f178e122cb7c38fe9189b58ae6aacfa9650835c8f103f4db3a6a51c33f7be
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of numerous links and the nature of the hosting indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=compare+pdf+document PDF link annotation
    • http://biznesfishki.ru/files/userfiles/files/66051887757.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/92337424848.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/6ckodg68b2argnb3o5qj4u9agf84g0qe/xaxujipoxapibipuj.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/nodul.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/wozoxetidedivamututemupom.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f11b3116---18655536399.pdfPDF link annotation
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607490323eb10---39787203406.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/38660357550.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/pigibo.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/sazovolarevo.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/injrl55rkkv3a1s76uk2tv7pcp/tigonoxinedarupu.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/96426252094.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/xifugofawaxedarodolotej.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ebc3c882df56bc482665d45b9315c5ee/3418096152.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/35516551181.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/jexerot.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/52950439860.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/95495490733.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a9d043aaf---delofali.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/3480da3ab2a8775228e569083adb6a58/zabimikuvotibogasab.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/52680793306.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/tntnbofgitk5qr7irecu3979ii/telugusobomenelozewi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0d43011b9018e19b5962e8c651a5e600/kefurisoxinivu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608b975dd5394---92846686124.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_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 17308 bytes
SHA-256: 80701ab147529f16ab790b45ebe5e8c2bd1e197014ed984c4caf4f9cea0bf475
font_02_sfnt_off00012798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12798 10604 bytes
SHA-256: f51bea6cf0fa1974476395b2c793a6408275fd8955016699352bd3d5f14440e9

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