Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab483b60c8ad982f…

MALICIOUS

PDF

71.8 KB Created: 2021-09-30 18:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d8b250b9f7734ebb470d696e15721532 SHA-1: 209fe2fd0c15b3df7370e0ffa922e5995c4ff163 SHA-256: ab483b60c8ad982f869014774ffb5dcb1a883657ddd0a7dc6778b6192ced59d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://terrebleue.org/userfiles/file/13560463009.pdf In PDF document text
    • http://goksirlambinowice.pl/img/upload/files/mimumiwegefikuwikesovezu.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/natepumewusuvofikolagig.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/wiwedufigulax.pdfIn PDF document text
    • http://archbot.pl/files/file/tirepi.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/xabetelezitofanuj.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16140e528dec44---13923189647.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ebc445405---xowilumelimo.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/20427137739.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/43214080276.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613440ee363a1---10496461423.pdfIn PDF document text
    • http://laserinnsbruck.com/static/80765111173.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/posej.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7c029d45d332c693f4f970a143c5eea6/90734515390.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/65602773919.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/52825765830.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/44941360739.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/77311870687.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/88575358543.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/86106303328.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/1715211878.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/43724371687.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/suvafofonum.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/17908934197.pdfIn PDF document text
    • http://ipceurope.be/assets/file/58506740672.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/74700430055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mario+64+rom+extenderPDF 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_off0000b729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB729 10536 bytes
SHA-256: e9184f1d674e66b2936e72072e0a06ccb3ba9d3fb78ace7d84fa09e6ba7b354e
font_01_sfnt_off0000cf35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF35 16532 bytes
SHA-256: a1659c7dd52cbd44df80b04e51103cc9035c408b567d0b851ac8e671590f442d
font_02_sfnt_off0000f95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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