Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7823dd99148b2a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 13:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 59dbc170978c194e88fe6aedaca46b31 SHA-1: 3f9e6d8f9fab7b281fdf3c66aac71a7305b4ec00 SHA-256: 7a7823dd99148b2a6a575c6d44a009b199ed0554d5d9739e9641f4fa53410bba
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to various domains, suggesting an attempt to redirect users to potentially harmful websites. The presence of external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=radhakrishnan+pillai+books+pdf PDF link annotation
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ba411e69a---75936058475.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/af89e71ab9bb3fa86e9931bc33778a40/7754032250.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/t3ti149578t6h15b35fbab0pj1/mexuvip.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/suzaferutelofuxobuvutupef.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a46a890265d---nafokojogenavabo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086d85181b19---fanigeliz.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/33114545550.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba015d2ad20---zunerapogivij.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/neliledovirelejoguxe.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/zovegomiwasigorubukufusok.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/lirifavanebekexamere.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/buzugifisijunulifa.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73ef70eef---nerufanorigat.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/novejujipikunowamaxo.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/1rmqho4vqg867u3g9l6lpk6ubo/demometelikarufosiz.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/menosururenoleloguvan.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/12141728965.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3498ea1428---62867617717.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b6bb57598aea219d16355119340b3f5f/zakanetomezigo.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/1964229ae8ebe994b4cd41ace9504356/juwozarefojipopizorazum.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ei49e68a2r4kpde6ghjaj7gstb/89012784933.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845a1a29b89---voguwutogojiz.pdfIn PDF document text
    • http://allasclub.com/campannas/file/24131308438.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/41666210974.pdfIn PDF document text
    • 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_off0000d1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FF 10644 bytes
SHA-256: 273134cd04f240420c287784d049c63b83270580cb50df628a49029d18802104
font_01_sfnt_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 19096 bytes
SHA-256: d6be97203d8f71ee67e0b671a74b24e0ca6ac5d3d86b0597baaba1dab33b9201

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