Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b71a333755efd5…

MALICIOUS

PDF

83.9 KB Created: 2021-07-20 02:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f6a55ba349713895bdc1df669c3e8fed SHA-1: 54d298ae95dce256f57b303a6e09b117d2f858c3 SHA-256: 59b71a333755efd5b474318bc32f2607929aa8dd754825e615e8849b90dc7f3a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, several of which host other PDFs. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The presence of compromised CMS upload links suggests a pattern of distributing malicious content through seemingly legitimate but compromised web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7d6083b83a34f03d49f4d4e4700ea7eb/22890584887.pdf In PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aba00e831---kilosogapigijafagakadada.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/92768798115.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210714_41C6F46BC38E3AAF.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/3e512ec509e402139fec55e1218bd398/tuvafexefuxanojifatigonak.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/19842667056.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/63713dbe4585e3cb3a9f8f50880f3afd/85320190447.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2eb1ec52---jomerusaxujumemuvewo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc658d5f6a---63503935206.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/87236484487.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/vazupunikus.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/gewovefamurot.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/xajituwogagavojetuz.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/21616525226.pdfIn PDF document text
    • http://effektfilm.de/files/file/xazukukinepidejupareb.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/zifeburedokoje.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/65799342120.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/80186817436.pdfIn PDF document text
    • http://masonhn.com/d/files/24804920873.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/moburavidexo.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/14795336993.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/83370589694.pdfIn PDF document text
    • https://dcimx.com/files/46155934672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=y+is+multiplied+by+8PDF 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_off0000e5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 16960 bytes
SHA-256: 36f160906091571af35cd8f9935df50de375c13364aa38da3a1b6cb190c5e3cc
font_02_sfnt_off00012a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7B 10612 bytes
SHA-256: 3c87cd475767a430d6eeaa7e253c0c3f1cfd87a3bbbab55c9b471f5c9a968f09

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