Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbad895805f68b0…

MALICIOUS

PDF

83.7 KB Created: 2021-06-28 10:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: bfce873e233426886bbf04ad3e1f5bc7 SHA-1: 550383e21142194e41565821596c340c09fa0179 SHA-256: 5bbad895805f68b01460f26dc5b24a963ef2d48304e7c8c1278340987af42e90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external URIs and links to websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple links to potentially malicious sites is a strong indicator of a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=mount+and+blade+warband+manual+activation+key PDF link annotation
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/rrdv31ka90cqbmn0knfrfo21b1/53446058880.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/89497619349.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/75367690121.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca0f5dbb25---5792476124.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/sezakabikabakabanokovumon.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/2266603289.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0ba7a424---xopabijafujuvadutiwarat.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/86940390703.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/59359574711.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079720640e0d---dofuxe.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/71415322576.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5ee73ed17d26837ae2676a195043c854/delelonokid.pdfIn PDF document text
    • http://splogservice.ru/content/file/momukikupo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b842e5b5e36---59357818016.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/62900985930.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2afdd6cf2---voxadonepibozinidiwovuma.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d3f94ff86---dizodizojibolamurapez.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a249551a360---67744691011.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160897bb636ddc---muretixivovito.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/dbfa45f10c23969ef3f4241bc119e89a/10660900914.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9fj1pr13fam2f96u182vo5b0cv/42365029031.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/40727654909.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c891312a0a---vifarenamunipag.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/favobofa.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/vqtedk519cjbl732rp9v8vg7bk/22130518452.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_off0000dfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 10956 bytes
SHA-256: 9075b92a717c21850b6291ca353c5d095534ece72fa828aed5d2c849f54c5c3a
font_02_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 18800 bytes
SHA-256: fa0d4aa03af514f52d28946d74ccf3347e021a7b676d56e509da9d0462fab678

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