Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f0a0fe37c547f9…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 22:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2542eb1d725391136c4148a4904f9eee SHA-1: 1213ce4be928e6ce74243c2348c03f38641673ee SHA-256: 56f0a0fe37c547f99fc65d5a63e838d866a2abd28407d03611813432a8cdd40b
156 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing or trojan variant. The presence of link farms on disposable hosting and compromised CMS uploads suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a040c25208---30827779223.pdf In PDF document text
    • http://novussiteyonetimi.com/uploads/file/xibivudutokagezav.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/88308058013.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/14656298014.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/kanukazezu.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/32313136335.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/98149341370.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/wasipezoweba.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/nugizefutawepejazixijoj.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/33989229689.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ca58327e---17846432375.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-21/20210521073003123997.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/65752f1d2969912ee1419d046d8a20fe/60344895128.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/bbf41f8a0d7e9e3a673a6708b91f9d42/kizojitoxopadugazinefu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf75b72c78---rotuk.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/84741434513.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/tagugorefoxa.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/31717707936.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/lesarogamibewusedewuwun.pdfIn PDF document text
    • https://designclarf.it/file/pivejosutar.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/15092934576.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d247e38b95e---46402592682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=medical+physics+mcqs+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_off0000db05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 10716 bytes
SHA-256: 79d401eeea40fa5f80c58fd595ea05020ee19eeeaa5b2de03fdafa815f2e8b93
font_01_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 18956 bytes
SHA-256: 1924afadddc5f2b4a10ac6f020a1e90a31db84aaac9a92af00677cbff7fa42ee
font_02_sfnt_off000124d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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