Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8b8db68a3fab84…

MALICIOUS

PDF

75.2 KB Created: 2021-09-13 20:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d8802ae09b3f419f9f4dad28b601ad6 SHA-1: c139f5080a6a50fb6d62a7d391e860fbe1d32f3d SHA-256: 8b8b8db68a3fab84b5f2d154495c179115c3277db5613c70b3e85ef6bbc708fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external links, many of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript and link farm suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=ppsspp+gold+ios+free+download PDF link annotation
    • http://hzqljsj.com/images/upload/File/80591669204.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/8955705007.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca7d9e22ad---88511423858.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/15050577212.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/45884866065.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce5974ac2---ropinewagewedataba.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/57399009094.pdfIn PDF document text
    • https://tele-video.ru/upload/files/posuvanaxir.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/23532661567.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/68988844770.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/topujajevewitakotepuvena.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136abbe5ff4e---31377369357.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/53361218094.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/purewugu.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/4242897312.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/77574626425.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/77436624298.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/15406755469.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/35307382974.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161358cf91d55f---89104667676.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xigatasoganofosituse.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/10984410683.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/nijunagilug.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_off0000c299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 10664 bytes
SHA-256: 05bf7d4d0d35034c48ee826a83a58957341c70979a50bcb8aa71bba39ad410e6
font_02_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 16944 bytes
SHA-256: 98dcadc215a60c309717873e67ccd336db50061ded92442fe25d2ff0a6350885

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