Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ed30fe4d1e3196…

MALICIOUS

PDF

141.3 KB Created: 2021-07-04 04:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4b920894d0cb04096e7ad80fca12eaba SHA-1: 823747ecb76c80266e742aa55575b2cb820b0d48 SHA-256: 63ed30fe4d1e319645a83aeebc5579530157b8e8304dc48e5aab7f5f21e776c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The PDF's structure and the nature of the embedded links suggest it is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/9i5p8gubcp9kddt3i8vqs9leekgq3p2r/gumutikaje.pdf In PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/wedaluregabonis.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/dv8flak6lfrfsjavr9bqdbq1gt/90053157264.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c42e21d288f---72721411009.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/24684115305.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6cc67ab9cac95d3fbcc11a787476ef37/laderataxug.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ibi9bcjs5oa46ji15o89qq96d/56968038485.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c725607b90---foxuparaxus.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2de3145b---veturod.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab10d2205---jologitigumepakukinojuji.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/libovixamaxo.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/repasemaxivawokozujodefup.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/xaraputawizozigazu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6ec94b639a985c0e7c76fbd668f4ce99/toxebibetekilaxugugukaba.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9f05d8144---mebolurokanatixoxer.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/06dfc17800712065c4807a6e75a4760b/82934835591.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de7be40de88---mufuxebememalepeg.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c79af9cee11---pepatuxofarajaxefoles.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/6ba9a368f6a640fcc1795fc6cf62dc95/8929358793.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/45011771912.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/7455907664.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/63845272735.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/mopopuxa.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/33ae7a5730206d4d358290c80991bc30/47989947854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=resilience+engineering+concepts+and+precepts+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_off0001c785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF97 18092 bytes
SHA-256: 3fb037cec3c8ac8962b1edf3e0f59f10fe6f21e5e9184f61ba6e1f4799e1bdde
font_02_sfnt_off00020e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E46 10840 bytes
SHA-256: c4135ee5bf6b2e3111a2eca839672f964c4a1ed261b9a5dda3f45aee6e30fd61

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