Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c7b50b43e4ae52…

MALICIOUS

PDF

73.5 KB Created: 2021-08-29 23:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1ff12dec75a07bd7c3bf61e9501901a SHA-1: 0d81c1873d2bf4c85e27fbf5997610df76ad788f SHA-256: 87c7b50b43e4ae52d973ade61333d380f7f25751bff99c57b4b35bf0f5e04b44
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the presence of numerous external URIs and the overall detection profile strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=mitosis+practice+worksheet+pdf+answers PDF link annotation
    • http://methese.com/upload/files/4109916132.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f4bc3727781a4ab9a8cc060fa640b963/wizobetameli.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a63fae62e---45389084120.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/3928127946.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/40746173674.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ecf94fb70---fikewadudix.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1d338ea294274659515dbe9fcc76a0bd/tudite.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16106cf52a32b7---84765072975.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/detevijom.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/kimirukudipigotabal.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/22777264139.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd27fcca7be---zosesi.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/75138876532.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/obo0g2brl70ib3m5krhlqivch1/rirejomubujugosuwitowu.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/tuvawevijarefabu.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c29de5748b31b6503ed9a176aee0cc04/jitiraki.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b251aaeb2---nixajod.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/zezep.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210726173638.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/matunupamugedoromemozevon.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c4ed433efd---49505795064.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/lowuzafiperize.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/fifikubotujuruxuviwo.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/52072189852.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_off0000bcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD5 10844 bytes
SHA-256: ac569854ab70dd81a9091a2b21841056ce03ae813f3619586e7e1e42cde67dc0
font_01_sfnt_off0000d5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EF 16348 bytes
SHA-256: 9b0d68d83716156d5452e11f4c8270553b55645c019b8028a98102ca51bcf0b2
font_02_sfnt_off00010037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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