Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa20533463b8e1ea…

MALICIOUS

PDF

89.1 KB Created: 2021-07-06 15:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 20ad09eae4cd761bdc9dae911921c0ef SHA-1: 5d2d7aa7c166437b9d59a33bde5f05502b90dcbe SHA-256: aa20533463b8e1eac1150c73fe9127f2f3aefab9fbed91597c82bf869fdb75c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress sites hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious links. While no scripts were explicitly extracted, the nature of the URLs and the detection as a trojan implies a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086eddb9f6e1---zolatib.pdf In PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/17ea25ee4db79b106398338f39906773/mipulaxi.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb7b0a9fa1---vixukone.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/girazetodob.pdfIn PDF document text
    • https://morabia.fi/images/file/torobabakaxunaxu.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/80654575885.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/95124081916.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852c8e08fd0---xejegijulagozipubalopu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af73f5c411---vubevemima.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/49056521789.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607933df6a7e1---winadafezuges.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/xarixizunuwogifajanukom.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/hhcdhbdr3klp8vqkhb4ubvhke5/tubagajukefabijoz.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/a3e9977994a928b38ded6b6ab7cad39c/jebomosojerekuzunekuzi.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce195148682---54924316327.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160712f7f375a0---43751285657.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ef2f91e8c8e8c8075278df6ab9aba01b/zibafanozulexavejen.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/q8ietghq71j1kg72qd26km9p7j/5009893400.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gogiwududon.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/93ded39dd2dd12a093f8e56e4472a931/9785324721.pdfIn PDF document text
    • http://adveotec.com/img/file/9128037565.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/ronutuvimati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=electric+machinery+and+transformers+solution+manual+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d45a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD45A 17024 bytes
SHA-256: 09a71e20814de12cfa7c7b0e3c27c328acf751f54ab3c27298104419212b1c90
font_01_sfnt_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 17592 bytes
SHA-256: 591af458aab2e8f423da891a2ce2bf0b7ec6256122bf047e4de7716abbd1dc06
font_02_sfnt_off00011a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13288 2152 bytes
SHA-256: 47374a8a3233b58a8ecca5772d3d4c5ef4ce2f4d200982825277bc06f6b61409
font_04_sfnt_off00013c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C15 11084 bytes
SHA-256: 07b4b4f8bca0e4ea1cc8a4ac4034106bd43925bd4f038739cb9ee35eb6c3f0cd

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