Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a893f4559c4521d…

MALICIOUS

PDF

86.4 KB Created: 2021-07-09 10:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3286bbe88a1d2ae337cff988cf7152e8 SHA-1: 0a1565aa229ea6050c55a30e72c91c9f984bf4ad SHA-256: 8a893f4559c4521d1a86baa25f87307b4384390f7cefe05fcfce5d398f00ab9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute malicious content. No scripts were extracted, but the presence of external links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pixomot.ru/uplcv?utm_term=south+carlsbad+state+beach PDF link annotation
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9fe0423e---44691392718.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/f5fc5529b4798b7b2928cebdfb8770bc/zifunabumefowoje.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/suzerumeladojexagimozilon.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/dusitoxevixezafimu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89a811f86b---mapaloletepebulev.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/doredilisa.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/25/file/20210525_203249_119.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c206be94d36---nonexanulobawiwoguvanofad.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/10955395398.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/neliziwobabam.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/xakiwanadarusu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/cusr61ua9eql5o6ugov1eap0uo/voturowaxolazokidu.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/kosidejiroreri.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/7349fe37e2abfa5334f36371976dccf5/92374379478.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/66768131601.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105101124.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607240e8d1918---lelixetutadunat.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/gumap.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/tazukositirasenir.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/91577971225.pdfIn PDF document text
    • http://feast.to/upd_file/75825286399.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2704edbdf6---38626278558.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0cc57eae9396c64014a719dbb0d940ed/siwumebererifafoxa.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/41019058527.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/55965959206.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160736f0513fd3---7427444444.pdfIn PDF document text
    • https://pindimana.in/uploads/file/xazozoxenaragi.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_off0000ee38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 10584 bytes
SHA-256: c8228df7150ef7054ac0966dfbf915b8f423f30fb4034653430bfc6b1320921e
font_02_sfnt_off00011ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA5 17380 bytes
SHA-256: 204f0a88669b4113b3d70e6ea2fd45cbb07ff207abb8f0037c3e50cdc619c303