Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb5af0c9c612b5a…

MALICIOUS

PDF

73.1 KB Created: 2021-09-25 00:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9f2f15caa8fb32d1e44c917f10142f3 SHA-1: 78f5cc1164d1102c03a360b7a74fb6d5e985db36 SHA-256: fbb5af0c9c612b5a8c95bebf025b03df8518096c60d24c8d67fabf5126c696d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting the PDF is designed to lead users to malicious or compromised sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mountmoriahcamp.com/media/60770439957.pdf In PDF document text
    • https://bda.ch/ckfinder/userfiles/files/zodimegix.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/vipizu.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/gavarodulabiloforu.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/3fc1ebbaca1474a40b775db03985fc2a/sudazulisikos.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/fiwajur.pdfIn PDF document text
    • https://longhoang.vn/upload/files/41422397653.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-13/20210913150419415620.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/jasotobufudirademapanem.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d4b5ed48734eb9be0c36b22a2fed0381/36249968104.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/22375217737.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/5353306683.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/9499304765.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/zimexotarojoridur.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/wesuxemodep.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/28552037983.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/98287203003.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/48066084900.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6b9ee204e---nisidozapenas.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/54438573666.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/14939248976.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/18453012324.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/roxasop.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/sibojawewomopago.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/domaxakumos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=transfer+blackberry+memo+to+androidPDF 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_off0000b678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8F 10944 bytes
SHA-256: d750969db0d1bf71428114de70853b314641e4215d61678ae0d968227389f4d0
font_02_sfnt_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 17844 bytes
SHA-256: faadeb2748750185505245f0f3afe2b8621206ddda8c8d24ceead4f3da73a285