Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cea2d5acca3207c…

MALICIOUS

PDF

81.1 KB Created: 2021-08-23 17:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 28415ba242abd176d6485321fbd90dbf SHA-1: 72feae3c6ce9c20b6ab18ea031008c8d57d1e933 SHA-256: 0cea2d5acca3207c8489f81be37311369e233245fa8829170448a7361af25850
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly indicate it's used as a lure to deliver further malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://riviera.az/userfiles/file/jalatekimiwa.pdf In PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210729_133551.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/dk4bddu3jkg83iibajm8mi7da1/32102004313.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080600e267c9---81848608091.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/varivejugon.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/4430733609.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/puzojavogerorejakenuruki.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/jerogosekitaboduruvatola.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16075f26dd5d16---tuzuliwemagewube.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d343d33d24e---81304450172.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4249df457---jibujifawawojoxe.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/xekakuzeniwidituk.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/sofoxitatixadilomes.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/merunixonutam.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89e858b4ad---favipozu.pdfIn PDF document text
    • https://tdsns.ru/userfiles/file/1330856214.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/02166303efbb8def4448dff0cabe4774/modapegitetubupebem.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/pikp1pk1ptckf50v3u6m429d6v/88380048459.pdfIn PDF document text
    • https://termoformat.md/img/files/66421612292.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/wepujutoxon.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/99770686449.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/rixezisalozibod.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/nujegubezibofizepud.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1957575afad7710afa7654989120de9b/22758954912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=not+anymore+alcohol+and+other+drugs+answer+keyPDF link annotation
    • 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_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 11096 bytes
SHA-256: d38d542d1d3f9a5dff0f7ef585b3010012c1432b8fbec6c7f645abceff7dbddc
font_01_sfnt_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 16460 bytes
SHA-256: 9dccef9896178ed1893e41ebc0b192eda2fdd20bcb327baa480d3426a50de9cc

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