Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c92a726f70b86d3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 16:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3565c8f480b48cdc13ae8ede2cd5336 SHA-1: 12e6339461d71e0e27cb80a339a3d96b61687f6b SHA-256: 1c92a726f70b86d38bc35d01f1f99d43ad69950841f04554f007ab87671181fc
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing trojan. Heuristics indicate malformed streams and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ad6b727f---kopidefa.pdf In PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133606410826---30784285822.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/88779950055.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/nojoxowejegifan.pdfIn PDF document text
    • http://imaginove.eu/data/Files/tijuxugoxojiseguk.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/12240609774.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/70456607822.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/fd760c030098ba5999a0fae25662dac4/kiguwiwogoxugomegesixu.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/xetet.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/19796405846.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/losoxidapisitemibi.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fcf0ae06d986a3cc76024f3cf8f86ef0/ligavupigomajajijubunuju.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/47430785957.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/wologi.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109031451144975.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/71842636308.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/toviwofubo.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/46379793682.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/lanoninobonoxomuxaw.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/44682276389.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/bb63a19a95bf5e1be30ee2723e94a0db/60602915037.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/nomorisume.pdfIn PDF document text
    • http://irths.com/upload_files/files/terarurasukezuriz.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/figevizavuxazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rom+manager+androidPDF 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_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 17444 bytes
SHA-256: 1901aacae90f1894aafdd35fe522543a857cb6c168bd76ae2695b87be058921a
font_01_sfnt_off00010c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12423 10324 bytes
SHA-256: 3fc08168eae1326e664881ce6e010bcb49b8b854a50a5054a4574c2b822be7fd

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