Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42af1566836f04f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 15:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c805c28add6387f8b44c80b706c01ee4 SHA-1: 24fab4088c48f7e879d2e563a4f471cb6f967753 SHA-256: a42af1566836f04f247d4a97386be22cb850a2eea10b47d4360c84b7c7d156a0
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711f85aeac1---43232579227.pdf In PDF document text
    • http://thumpamonpally.com/userfiles/file/zusone.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/jivafizefujuleka.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/surodefunuwunareviso.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098d2c6555e6---pidagizizafuxemesedabobuk.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/zukipazipabede.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/xafegetemirajufukivokuwi.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/94359862013.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/zokesurebewuwidazukugi.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/628ce2efc013f579a30a16e6610968a8/tenizufifolawexigopodo.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/lerapefazo.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40b1145ca---silubizuda.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/98158556609.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/17502033362.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/vanotaguvixadutex.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/bb481d51beda866b1ac5ac80bead8230/pezuwovozekug.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/a6fa593433d2251213f9f10646a4fde9/13094395357.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/48687058119.pdfIn PDF document text
    • http://hajni.pl/userfiles/file/jusojenivilug.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/22498516221.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ce5e050c59e74760e003bf24cf5dd239/45194427855.pdfIn PDF document text
    • https://eternalbliss.net/file/83342187288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ancient+cities+of+indus+valley+civilization+pdfPDF 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_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 17604 bytes
SHA-256: 9a049af34fa8213b905c61d9fda7ae227f2bf45ff377db6b19e88c8842d21aba
font_02_sfnt_off00011cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC4 10832 bytes
SHA-256: 81b908b99ad9bd96ea4e5f5231edce5ded875a045f4b0bb2dee4ea01e28863d3

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