Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da6d07d7af833a4…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 10:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a2ef7978f0377b0ad6db66e80438f7f SHA-1: 9f2cbefc9c2b56c5fef2437aa3b2ff4c2baf0b34 SHA-256: 4da6d07d7af833a4d1c74507dd9fa908838a624cf64f47626aa0d8740d6bd3d7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 http://personnelstrategies.net/userfiles/file/64617547517.pdf In PDF document text
    • https://konyaalotaksi.com/userfiles/file/towibinolax.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/zumiluvurivapinipupa.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d8ddf0d12---xoxetupotigine.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613258dc06060---nanupuzegovebadilibumase.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/24057623035.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/lipafazigopazifuve.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/72344298294.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/66344666206.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/jazuvo.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/10428915917.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/bdc59d2c531abdc75f11ad0453b271e4/vaximaboxikoniluvis.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411d4d3b46d---67424133077.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/41966143072.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/sexiforodetonefabo.pdfIn PDF document text
    • https://architektor.ru/uploads/file/42043115384.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/85694613070.pdfIn PDF document text
    • http://mousike.it/img_ins/files/lupifusuzig.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143769423ecd---31528712223.pdfIn PDF document text
    • http://trieuduong.com/images/Download/28385222261.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e54ee05f40---50989247114.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/40267741426.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/zupesasigelawakepojosom.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210909032925.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ubj1h8gq4oupq2j0b7dkr5c3p0/javowiwidagis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+check+android+phone+temperaturePDF link annotation
    • 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_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 10836 bytes
SHA-256: b048f694ce812b2e8b11dddd9bc1182bada6b77f9ec4501af53f1d7b3caa80ae
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 16596 bytes
SHA-256: 9fecbf98e4964e1dbe3e28f03333b1113d5ac453be0ca772bd988e735011c5ab
font_02_sfnt_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1