Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa797142b7cbe981…

MALICIOUS

PDF

73.3 KB Created: 2021-09-03 01:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f388a863b4cdc5efc40922a4fad9e0bd SHA-1: bac8d199a1e5999d41ca05207bea79eb3e443e16 SHA-256: aa797142b7cbe981462a829fb5ad4dd0b2fb5dd4aa84f877ae4c9701618f5bf0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm that points to multiple distinct hosts, many of which are compromised CMS uploads or hosted on disposable domains. The primary purpose appears to be redirecting users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ec2c8046da4bfca4de2108ecbb87fb2f/zadometapudamaxetebutob.pdf In PDF document text
    • http://wisdomtours.net/upload/file/68196658444.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/cb95b11d9f14804a526207d5602aa89a/wijifemetom.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/menela.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/36332182162.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/kavixamapakedoludu.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/29300306489.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/toketujovetulirirujew.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3bf2fee0a1ae0ccefb958ccaa8c0e3e4/pobitetawaboza.pdfIn PDF document text
    • http://www.pilartangguh.com/file/11749611898.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5295022da---10164156543.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6a84ba3e---14042452939.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/zodadimitudasujofofoj.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5458d7fe9---80047540737.pdfIn PDF document text
    • https://noddy.nu/images/file/mowolepejev.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/vikaxuxujinadulizu.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/xijufinefasiwob.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/95289785988.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/berogotupotiwedezebo.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/pavanojulabalazinotuk.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080f76c00879---gobanifepetozijap.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/hnchlrqgkqs3ium9svm3rd0ge3/masebuvomitid.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc402094e3---rorevelepesusujasuzeloma.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5fgem0gphf3ggk2nv8uqkd0582/9686903923.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/kanunuginijorekep.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a18701ab9d---vafus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=safe+shop+telugu+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_off0000bd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6D 10656 bytes
SHA-256: 87fa0409949647d54bbd1c03a023f2c10a7868aff4d477749b4f43a3245afddf
font_01_sfnt_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 16504 bytes
SHA-256: 6bfb4871b38d337740f2e05fdd7b07e403fddfeb0034fe18990f4d3c42c972fa
font_02_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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