Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5889f299e51d14…

MALICIOUS

PDF

68.3 KB Created: 2021-09-12 20:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6970e4bf2e896900d9fdee68a7c4948e SHA-1: a339f1ca199add374c1485d0579db76c354de17a SHA-256: 0c5889f299e51d1455b75c3f3342b660c16487be3c09927c5955792dd3368500
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term=apk+mod+installer' in one URL indicates a potential lure for users seeking modified applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=apk+mod+installer PDF link annotation
    • http://3qbuy.com/CKEdit/upload/files/ritagusiduw.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/24985641548.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d8208a06---buvikoxijumaxemija.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/4375485521.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7c8e31990---domive.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/bewugetupanakujedafuzinob.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/56515504230.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/penewisonunazozipazax.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/746466238613c3ad2aaa15.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/32871229881.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/vogezapigidaxesuvekeko.pdfIn PDF document text
    • http://orthodoxnews.us/file/tumuvuxuveripamavupaga.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/58114374619.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/9351615652.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/memusufafojilofubudikema.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/66699505518.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/26611773297.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc17e3895---88214381258.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/vamenonepazale.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/20230441476.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/86900023851.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/96705742668.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/35410465002.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/nosunaropezufirulik.pdfIn PDF document text
    • http://fluorescent-training.com/file/5858948870.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_off0000af95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF95 14592 bytes
SHA-256: 9ed79473d269ebd566e49e3b2a8edcf3b901dcbae594356786f399ffcdf217fe
font_01_sfnt_off0000d3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 10628 bytes
SHA-256: 4821cb1b10e63739a81cc99b386828a983f1837ec9b4a3c705ac7d77ca867066