Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a840127fe8ac49…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 13:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b60a3c7591499ddadf2de3e723876c0f SHA-1: e925d41f7dfd6942ed3078db501d8c103ab3d5c2 SHA-256: 11a840127fe8ac49d87ad85972bc5b54132df5aa357eb49d7859bc682c06e464
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/guron.pdf In PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a01c3aceb53---wurenimoruretilawewo.pdfIn PDF document text
    • http://www.puhito.hu/uploads/32430570568.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210618_030718.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/59930721007.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/6ua35r9mv45agtsmaeqb7rnq6p/37843513954.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9a962f825ae815ff70c4a8169f95e130/99176326498.pdfIn PDF document text
    • http://cjatkinson.com/userimages/napukabojemovopi.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/mk42am56kk63mo1nh1jg2n9gvh/14799385027.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/6rnt2d85oh0b9k9lg6miri5eil/jiwunekidapegaxiwibebel.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e05815f112---43373319333.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53af574975---wipinatazo.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/79552464219.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/fosilobuwumilewudikije.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/73007134075.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/1ql7ifqfh2gm4dcl2s7d5sfdpf/66618806030.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/jekilinuzizufefu.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/gumadeg.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3dcdc729---86438644727.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/1c221ccc8493af722c97b5587960b301/xoribopisavak.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8141f37b7---baparasiribe.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/wenog.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5393dbbd3eb66d573dd5ab35bc22c2c9/65347016216.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/13227425552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=bompani+ecoline+washing+machine+manualPDF 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_off0000da0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0D 17900 bytes
SHA-256: 708ee38b6b312d7a28ff158e6eb273ce81c4fba7fd608b6b094d08539345ce16
font_01_sfnt_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 10860 bytes
SHA-256: bc7839b9290bfc4e93b9148be5bb67a65ac0046226beac4ea1ba8f296fa8485f
font_02_sfnt_off000120c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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