Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c5668673a5424a…

MALICIOUS

PDF

81.9 KB Created: 2021-08-10 21:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b5aeab1fc675ab6c0d32da36e0d7e7f SHA-1: 10d80442873f9c7250660ac83ad115e7c0a2bc72 SHA-256: c5c5668673a5424a9e141e2a284cf8593db69e531b3a406bb2e5d39228f047b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the links and the detection suggest it's intended to lead users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=unfallbericht+schreiben+%C3%BCbungen+pdf PDF link annotation
    • http://alpanelektrik.com/depo/sayfaresim/file/42246258890.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/4487240152.pdfIn PDF document text
    • https://rotitelor.com/contents//files/22772266998.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/61098873312.pdfIn PDF document text
    • http://klefmarken.se/upload/file/revituvojuvavutaxuzim.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af08e865a3e---30953670417.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/75371681545.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/4mtpna37e9ek0q2m3cmbisk46j/mibevilif.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/fugujebavesozafewun.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/98353603529.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/10a686dc20f0166e4dd325aa5447ff0b/rogojelifazajo.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/92b800f45f8f8149e39dcb4f2652fab1/wobiwa.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bca030e77b---34999096510.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22cccaefb5---74852135340.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/f4jilu5641mi5b34u19nsdmjlm/8336988652.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/dbabb89a48d56f34f88e29f558daad3a/bejupekizunalifovuturon.pdfIn PDF document text
    • http://sdes.in/uploads/94369975962.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607570c958a51---wamakakusofibe.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711fb7b5676---58376482457.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608019008c95d---96267490034.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/13270634463.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/26a10c3fc6eaca259529d515a7d885f4/96970035128.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/359cf10cf0ffe89531a084d42b5efb34/85573545089.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_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 11220 bytes
SHA-256: 3e3311a416e1179410633913cca0232daefdc44dcd8bee09a5147eca37a6cc53
font_01_sfnt_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 17612 bytes
SHA-256: e27b40f25b6b7084ec988a5862a1fc7f51c1c256a41b1e4fb14dace0b7ae23ab
font_02_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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