Malicious PDF — malware analysis report

Static analysis result for SHA-256 8466f550e59c1717…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 08:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2433bbc37e7d895ef51470bd8a10c0ff SHA-1: f8708639ad9a5ba956395da0048a31cfc1559283 SHA-256: 8466f550e59c171716da1a0ac8c26a6add9ee167cd50c5199fbca7711fc15d5d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://amandatravel.com/userfiles/file/jotojegatabavaziz.pdf In PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/36698433106.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/4de165b8115b284807e4669e5bed96e0/17439094945.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/xonajosabojelalogu.pdfIn PDF document text
    • http://jaika.in/images/documents/files/waxipop.pdfIn PDF document text
    • http://ipublicity.cz/data/file/pilikekamasilonuvupuf.pdfIn PDF document text
    • http://asid.rw/userfiles/file/bonawifewawagaken.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093d2062847b---44778934021.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/pakobujipip.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/c25a622c7f23acc520557b1af072dc38/65515916687.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210808102633.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075896933601---99897170922.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/13960213404.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/85180735300.pdfIn PDF document text
    • https://kimcert.org/E/file/guwijoremeretu.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/wefutapig.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/1810453112.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/45042443498.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78b795bbe7---59231795487.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/xeponelojir.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160827ed8c3b77---tivafarez.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/relunarikelafalas.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/285904efad2461f9225241866daa3142/95373367978.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7c9314ab---29596589178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=slant+asymptotes+worksheet+with+answersPDF 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_off0000c545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 10884 bytes
SHA-256: 2cd58261422ca927793429b7e2d55db7b3974c36b21f1ba85ed2c3f542a6b415
font_02_sfnt_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 19888 bytes
SHA-256: d7b8b05317e0ecdbffd0da2b176e413d4f94ebf85b68b2336bd0e37df1467e03