Malicious PDF — malware analysis report

Static analysis result for SHA-256 280a46665d4397d8…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 03:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1a721429ec11e7216af662a2b582f8e SHA-1: c029f6f4b6d15368023b7a27873e506e97c63062 SHA-256: 280a46665d4397d820729c82d42842e742fba35671c40d43c9485c20c14d2be5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload locations, indicating an attempt to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://alburigiott.it/userfiles/files/69331267537.pdf
    • https://baxsporthorses.nl/userfiles/file/nezajekafetozorumolu.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/04a5e96435243d7f0f93a093754bad50/powunodujunofukikakonupis.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8f4ba0c6134eca42395c288d3148c81f/98780023229.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4fc45ee0abb92236a260bdf92065539f/zepijaramagoxatuf.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cca9d68b6---42526834135.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b1b7d011---zijajuguparonojagujoveta.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608178789c713---nemoxobazuz.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c1ba5a0a74d58c8d032053d216fddeaa/dovojadeje.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/78831d50f9a9ada27f0c36ca4a2e2c0d/52773316311.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/3gk404jkme1gipbhb49abd102n/wijidik.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/ca5b4e21cbcd1bac7549f17fd7b847ea/82837114991.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/doosrhofdt7s6vpvq0g6lmb1si/21102482434.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/3a6016778a96e1d2f2ea0291ec7fd7d2/razijojojoriwaz.pdf
    • http://tetraeng.it/userfiles/files/14697968921.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef0a4da90---20853825947.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c56b02ba41e---9040799971.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086daf0128a7---kibarove.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c892ac48---wuwifasu.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087202a72fd9---22816561466.pdf
    • https://davaocarrental.com/images/file/mokajesatedasezumufopoba.pdf
    • http://cintabogor.com/Uploads/userfiles/files/78392914955.pdf
    • https://yuss.it/file/56823741016.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b499cd2addc---57398522117.pdf
    • http://beijinghuojia.cn/userfiles/file/naroxelatomapujamu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=harry+potter+sorcerer%27s+stone+streaming
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c7.bin
d355a218e4d0481ca5146d7004026f176089535714aac69bdae4cbe961ce723a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 17344 bytes
font_01_sfnt_off00011f09.bin
31bf49fa92bf2a71edcebd5ea544b2393d3f4da6f0d8e778978cefe82c5454f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 10808 bytes
font_02_sfnt_off00013806.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13806 16792 bytes