Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0cd0288a18cfcc…

MALICIOUS

PDF

84.0 KB Created: 2021-09-15 16:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 326b2946655ad931fce7b21fab9ae9d1 SHA-1: f0dc71a3d4a3e40d4879fd7ae941ba0daee4bfea SHA-256: 5b0cd0288a18cfcc85dba726dc1f5c5e2ade47e48c8aadddb0de59fc95fc3f22
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a payload via the deceptive download button.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=wr3d+2k17+mod+link PDF link annotation
    • http://finara-v.com/file_media/file_image/file/14115953106.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/15204200608.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1612f38f6c6745---litusutolokufuzibal.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/tudoxur.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/tenotebototakude.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/19515609774.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/23588951707.pdfIn PDF document text
    • http://atamergranit.com/userfiles/file/nanijabopesidelovoguf.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/13222649909.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f79bac94a6---22286660543.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/wuvufigowefimo.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/veluzugatojis.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/30299597767.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/jedisujomam.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/zavaxoboru.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/91853992909.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/82180940431.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/55062183155.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/munivo.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/5431654781.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/51736159694.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/23c289253aa3beaf39463f2717230259/tugoso.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/32970652688.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_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 17932 bytes
SHA-256: 4efb9eef94611d612dbfa0107ed784820ef6e809d919360de10d273ba6cc82fb
font_02_sfnt_off00012b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B50 10328 bytes
SHA-256: 597de75d4d60e7b07a8b7ecb9d07cf447d41db0ca7a8fe56a7e66e368c87e6d4

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