Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d445ff090296d15…

MALICIOUS

PDF

88.1 KB Created: 2021-07-02 23:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 26db731d2701e0846e4bcd5d06dc8ad9 SHA-1: 71b9557d69085f17c3de42ad3a54c2715748c4c9 SHA-256: 7d445ff090296d152c0c0bc24db2b8aebb9ee69dcb023964d51814aa55bd20d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites. These links likely serve to redirect users to phishing pages or download further malicious content, aligning with a spearphishing attachment attack pattern. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=phase+10+cards+rules PDF link annotation
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080cbd6e0c32---fovejidolivawiximorum.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16075614300fe1---69908496440.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/52873dc35aad77f0e2b7eb76f71c6de3/banetitibajodafavenazidu.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/fitalorenulof.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/436c0a9ec7cc87d0fd4e16b1aab3ca02/91125664714.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd229e94321---refojimovaxa.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/61882361928.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/decfho33aolfacrve54ih0msv6/didilowefadotebetezefewud.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/wugajur.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/74968451607.pdfIn PDF document text
    • http://prosquash.by/data/fisopokobafasik.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fac562c65---60618107381.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/96658242877.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/5f0ada0797a8396ff920a2619913c4d0/54398169221.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/da3965dd000c954069d62afe125c2d2c/pejefukesi.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17943a7f6f---solapet.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d7d18b233d25bc16513818d112ed31ff/60868075951.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7e27a8440718490cad015ddd841475d2/pisijibitomuxanukis.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5db8efad4b2b0f27eb24b937b5c4d2e6/7394193418.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/genipupomosobobotuwini.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/54352032920.pdfIn PDF document text
    • https://motacademy.it/file/kogevaketope.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_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 16440 bytes
SHA-256: 51a7fd669b3ff5df8670fcaa3176e3b25c4289f3e8b26da87f3546bb964959c3
font_01_sfnt_off000123d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF0 10328 bytes
SHA-256: 672fdb6721c81f22e4d325a597e11edff71368b5bf793bbdf1f6ecf51485d0b8

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