Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ad63c6cf605682…

MALICIOUS

PDF

78.8 KB Created: 2021-07-18 17:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6daf7a981fa9b7479849fd6089768331 SHA-1: f0aaf9f667af647816bf82821b4ee5038f2a8e9f SHA-256: 18ad63c6cf605682b01a7869669d703adaa61213617bdf51cca64c79cfb1b1b6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the embedded URLs and heuristic findings strongly suggest a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/dabf1da3ef80c7ab61864383a7b0456b/91986068009.pdf In PDF document text
    • http://blevy.com/ckfinder/userfiles/files/sagogoridur.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/59590580791.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/bed590dad54f0bc2ea28e58925da14ca/86188070856.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/74279792276.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9b881901b994ddd98059401cfca03a0/94331668069.pdfIn PDF document text
    • https://kuepancong.com/contents//files/61261630859.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/e3e001f698bb28254a50b38898001f54/wujuw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d7b1bc7dc---47682558186.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/35479501334.pdfIn PDF document text
    • http://xinyuemu.net/assets/202107/files/20210718150216927068.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/78978543815.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c920768fe1c---jivebujokikekax.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099b155f0123---52641006723.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///12517972777.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/gutuxinomajosetulivawur.pdfIn PDF document text
    • http://george-dollie-nelson-mass-reunion.com/clients/3/33/33de80a6744892f7217a81a137582dad/File/fagukirer.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f359ac398e8---sobugugerefudosidukivo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/8151dd55f66007192f53c631945e7bbd/kuvegisevaketazar.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc26d6b4b0---37736130707.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9f02dcc49---muramopudikobirofujejow.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/gezoriv.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/watofulirodinonowuv.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ca14145824ad7a1ade19b9d5393467a0/46885007061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=10th+chemistry+textbookPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000d172.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD172 17288 bytes
SHA-256: 9ad1b2e51346daecd453b0d52e8441e7b6a96c5e19eef3116ef8f07cb54a316a
font_00_sfnt_off0000b961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2F 10708 bytes
SHA-256: 0b06c115778f6f3bfcae3e016e74d6f7d4994a70cc2f9a03313eb49cff5af6b2
font_03_sfnt_off000103d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 15652 bytes
SHA-256: 54726a93140d70b31b0ad7c8c36625de50cc5271795644dee7c5e67229131f66

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