Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa892da888f57e22…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 07:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b4e0e02b0a30754561409ac4a68be10 SHA-1: b990068ba70f9c94387af4157e7f3fdfe9a41807 SHA-256: aa892da888f57e22229d2c9325bd91517b73f5d8dbddc9698ba4601ae73591ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, with several pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO abuse. No scripts were extracted, but the presence of external URIs and the nature of the heuristics suggest the document's primary function is to redirect users to malicious or compromised web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=obituary+poem+theme PDF link annotation
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ls7dkvhjk4fnbe0e0ikp4c0cco/88063910678.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/88216761787.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614518cc8788a---lawajikume.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/sasexozezemofivasi.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/98131147052.pdfIn PDF document text
    • http://awards.nl/img/cms/file/zoxux.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/77631737786.pdfIn PDF document text
    • http://stringladies.cz/userfiles/96968703636.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/mulojejozosivupamotufemu.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/sasuxeborexitimaj.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/nutagonepepa.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/fegolevubulevij.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/pirutebajanaba.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/48810000222.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/17832831862.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/gufigawoxotimajazujixiji.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be7ac763b0---58465749747.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/wilar.pdfIn PDF document text
    • http://archbot.pl/files/file/nifegezofudofiruxorurux.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/zakivitulonugoxe.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161461ade1f121---jigaguxitalijeroviwurefa.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/21738383125.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/50516314761.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/gorugoj.pdfIn PDF document text
    • 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_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 17936 bytes
SHA-256: 1a03c43775280443f60efd71c0d94e9d56c7b8fdeec7a8f367c34794cf84587e
font_01_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 10576 bytes
SHA-256: 15b464cacb9b6479bc8d027a1997396d00942725065bc9e42f37618fdb29c7e4
font_02_sfnt_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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