Malicious PDF — malware analysis report

Static analysis result for SHA-256 65948f87577c47eb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 10:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 316b7d7423a8e961e42c89d5db899d0f SHA-1: 4894af86194cf2b8b6192aa148d766c325d6b01f SHA-256: 65948f87577c47eb7fa28679edf4cb509654a68fd1842c6181536e9c8b5e75a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a spearphishing attachment used to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=dragon+reborn+pdf PDF link annotation
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613204312db5c---jilarume.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/75914782519.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-17-20-52-58-92.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/56142421695.pdfIn PDF document text
    • http://generoussecurity.com/uploads/texevebuzuvulajal.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/33203458263.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/buriro.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/29505538885.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/bokizinorewaroxozodejeb.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/74982775921.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/15936059972.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/zefovalowipivekuzufip.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139319643894---gomik.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/93527769165.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/49307583020.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/lepumanuzuxukivopa.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/8283509179.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf63db4f4a---nikopezakepizona.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/29202498237.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/57299059640.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/69497238398.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/vetatosajabupitukuzikej.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a8cb10dc534e0ea05a96d3e94410d9f4/66016680141.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_off0000d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 10408 bytes
SHA-256: 3073df4f24e1fcaa83171bad455e2a6705609bae89f9e92f826e6cfe4a1968de
font_01_sfnt_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10622 17164 bytes
SHA-256: a7a9f4d10db46ad484b683f136e4131b8fea55b57b2656f273db4b2a33c61d5e

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