Malicious PDF — malware analysis report

Static analysis result for SHA-256 c447b3918adf38b9…

MALICIOUS

PDF

77.9 KB Created: 2021-09-11 16:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b2e482cf6fb2c37d787f933d18512b19 SHA-1: 80a97c6501676ed9d49e478dc3090ab38ddfd229 SHA-256: c447b3918adf38b9480c1c07aa85f5040bc3db2d668bb33bef32324421964fc9
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. The presence of numerous URLs, including those with UTM parameters suggesting tracking, indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=hack+royal+revolt+2+apk PDF link annotation
    • https://bilegt.mn/userfiles/files/66753694691.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/16233065505.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/90025234908.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/54924562633.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/71145105060.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/841584630.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/poxuf.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/33500204416.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/39860276677.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/bamesegi.pdfIn PDF document text
    • http://xenangheli.vn/public/files/23813934924.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-2/20210902200112732163.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1982a9d9---saroka.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/vuvarimuduwiwigokeba.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/walelukopotunu.pdfIn PDF document text
    • https://egca.fr/userfiles/file/83929151231.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/midilixigakawuz.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/bakagapisujix.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/r6aur0en0a8sticosgr174t5kh/xojinuzomojilovowufa.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e856e870e5bff9f5c527ec795d788601/jiwaduzoniwilavud.pdfIn PDF document text
    • http://aweibel.com/Photo/file/fupemaxexemovomibepon.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/90903014459.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/zuwanef.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/23913732014.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_off0000cb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB21 10384 bytes
SHA-256: 982e8de8267ecab2ae6d3d849c7ad034f7b5cfacbc64ce682e93710e5f82eb51
font_01_sfnt_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 18032 bytes
SHA-256: acb6455e6a57746155c66cbd7e6ac33c567a1172a3540f098f6443c2a64d1378
font_02_sfnt_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1