Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa58afaaa5cdc83c…

MALICIOUS

PDF

112.8 KB Created: 2021-09-05 12:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ccaf741b1894c9dc83cfcc83e494033 SHA-1: afeb2ba14a02e0d08d67d71f076475fbb9f1094b SHA-256: aa58afaaa5cdc83cf2745db5f1cc9f7ce09160cf49d0df8c9d50182295863cca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate effort to obscure the final malicious destination through a network of intermediary links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://owv-sad.de/userfiles/files/36547540104.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/faruroribitetexefugizamo.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8308fafb2365b46efbf0bce31163c4d1/vowazolujakisotakepufaf.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/jiviwatiwupirejutetiz.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/titajejime.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a84d5522---xubosewejurosoj.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/lavalupivimumo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07cdc4f2a7---nogetozilagejuru.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/xezakupirikopedubofulo.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/709329638cbe2460ec0cb9fca510135a/49427484930.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/18396979205.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/98437298176.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e40c5059f---wozorakulilobikixini.pdfIn PDF document text
    • https://limadelimon.com/images/file/kosuj.pdfIn PDF document text
    • https://shinaltd.ru/images/file/90438324948.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/67028375203.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/70846443265.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/b8cpvrl14fod98tj64l1sfmlg0/49694023072.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160797e2385f64---67825818602.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/bidudifaniwuwumorubupu.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16091daa9a093d---99687089065.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb6391bf1a---mukuvofafe.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/96806105047.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/kasepabajotikolalad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ctc+ecoair+125+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_off00015228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15228 10660 bytes
SHA-256: da9fdd7f7f0127fdee4e4241f60b9b3e09034aeee5a3404da3fd88a9b6c6ee10
font_01_sfnt_off00016aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AAC 19268 bytes
SHA-256: 3517476aeb05d44f7edd9348611013357d0f30f29b2fdfbff86adaea7a08e492
font_02_sfnt_off00019d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.