Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ddab21d7ccb3df…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 14:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9570b1b9d61ba402f6f11813b306567c SHA-1: da0be5a2720f376f3dc22fcacca0b3fd5a377865 SHA-256: a9ddab21d7ccb3df469fbc9268aaec84289fc8c416ca695cfdb537ced7f695e5
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/841dc4c3bb40d75b5d6e71c8d6c5ae39/mobazafomuzufodom.pdf In PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/96808655317.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/50623722118.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/33076351967.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8f57d778cb9247db57421db7b63d2b35/vewaj.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/53003504696.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/jonafiduwivigupeponebar.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/91537547893.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/p173d5rgp7q5rhc0jqffgnnjem/40565223968.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/pejuzixeledalebutus.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/ziladopiwixupap.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/47572382579.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075bb125a5c5---88536619334.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d71a78879---99887684164.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/pivubosukaju.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/30vij599hcc9sj3o0qc4kmrbu0/47142391710.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/66r32fj211nugspsggtqcooj5s/58208348874.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c088297b4ae---bojot.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/12354525749.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160852ffb1ca93---20032787899.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16109b1eb90275---2262243585.pdfIn PDF document text
    • https://tempegaring.com/contents//files/26682804139.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160cfab5099599---robawafirozisuveriludomi.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/wokoviniluxapubojibe.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/16831574484.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/81274632043.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a33c8939a0e---73766199313.pdfIn PDF document text
    • https://hotelcorona.ro/files/sorowugixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=psychology+unit+1+and+2+textbook+pdfPDF 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_off0000cb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB88 16328 bytes
SHA-256: 43ef01c67434e4296171c3ba5e5c48668a8f07f3da3a93114b14d4334f33a6fe
font_01_sfnt_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF0 11520 bytes
SHA-256: 528549833013a4c095e4250274f3933c1a540d057457bbb372a6cd60af0adb81

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