Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a06813de0cece56…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 07:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4c7edcc0437aba046b046fc9a14558f SHA-1: ff7d8c3cba25b9b63d1c4fa77fcaac4048659889 SHA-256: 4a06813de0cece564308f28df4fb332f399bb3a8f6a8046a00b7dd288f3cc01e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many of which point to compromised CMS uploads or disposable hosting. These links likely serve as a lure to download further malicious content, indicated by the 'Pdf.Phishing.Trojan' ClamAV detection and ML classifier score. The embedded JavaScript is likely responsible for redirecting users or initiating the download of the next stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=decolonising+methodologies+research+and+indigenous+peoples+pdf PDF link annotation
    • https://aurorabersinar2.com/contents/files/wosasifuxixotawovilakilib.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/43221958006.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5eaa0bd82---todigezada.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/88191344068.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f508b70944f---45586625416.pdfIn PDF document text
    • http://zatacorp.com/upload/files/81452788144.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/80958175296.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/54798478791.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/bfc0888de902377ef2ee394ec854498c/13295477736.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6b92a90ed---xemojorodajevanu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16128a28f629d4---putizepo.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/3704cc15de3793f37928e180f9dcb71f/wokijekilixafinugilu.pdfIn PDF document text
    • http://mav-auto.ru/images/file/85007936458.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e70ce5e4---gobavuwujejenagitozibu.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/wisev.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/1brh292ko4acr6likcv71asuf1/19431520571.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210828144813.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4d95f3411---62903041622.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/kadijujamixupi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/uk3kfdfh506m4c5gekl7sgd5ha/poruvopelevi.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/deebdef5a688e116c4800b4697f58d75/bomipupupenozulo.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ac0eb1b0c214f7d99d24c3af151c1166/84318907023.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/setusizevinetofanasesod.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_off0000bac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC9 16144 bytes
SHA-256: d84630a765600e92d7805cce9e4e66ab85682b13620edc5dc84e789a6e8ae007
font_01_sfnt_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 11168 bytes
SHA-256: 22fb8c729598809fe67f35f494682bb17147693c272ed443b2caa22e3b7b0bb6

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