Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa26adf9a3ca7576…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 07:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6f3c92d9c309c620e13644dcbe7578de SHA-1: e75de8d3a2f9e38dae9bb59e2d881f60b91e5c49 SHA-256: aa26adf9a3ca7576326c2e66468113280eabe32fc499f4b811d80b29de5c5b63
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a tactic to distribute malware or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927f1c973ea---12321339001.pdf In PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750916bb077---6271671124.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/95967721315.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d9bd8ae5c67be54a455f2b2aa29b8a5a/xukadofinoma.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210519230617_1452096349.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9d3bfb2c---minevedemupurovi.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/170il1k8cnp97p30nmmlk5c3h2/bimukaj.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a924d77e9b0---36038802068.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/45536110956.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/6689677037.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7b3e122a569a3d907f925b8ea22fe6fa/92860800634.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/22e0dfa9fe0650a68470464cffa92025/kopitamakipe.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021062413492473499.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/1a5b44cab047c5fdbf9d38218f44ccec.pdfIn PDF document text
    • http://axwelindia.com/uploads/xebivewigovorajotirix.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711635545a3---93121856305.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/c1i7fvo81pm3fki62sqg5lmjqm/waxesikosegumolitewuzufe.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/lodajanalenulezado.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4508dcf781---58571840369.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/7abef17390e3c80f6e6feb8688c80296/vadegakatabe.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/debavirupan.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/56256205575.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/dutemuvagipiwevabugegis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mary+berry+all+in+one+spongePDF 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_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 10576 bytes
SHA-256: 3d040c3fc0c69164e4ac18da37d5f90d5b4403dd9660ff47b136e0c81397e6c8
font_01_sfnt_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 16832 bytes
SHA-256: dbe21e6998973a8b9101f295d29e675dfdb2ae2e1e462abab3ea09e7f9d92b96
font_02_sfnt_off000136a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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