Malicious PDF — malware analysis report

Static analysis result for SHA-256 28efecfa32c8ee00…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 08:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9a401db0629ac359fa61697fd3a552a SHA-1: 7016cb65c58da879b01823b49bf3484e709315fd SHA-256: 28efecfa32c8ee0038e9e98428e0012fc7b992d4c8c7a4405f88c657cf4e7c1f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://de-ko-gmbh.com/ckfinder/userfiles/files/xiwakikapega.pdf In PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/rurejubu.pdfIn PDF document text
    • https://anjingliar.com/contents//files/14169112220.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/37892218001.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/subozudit.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/sanafuzodutefawesowus.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/52c08060a0a1672bcdc2795b964ce0e7/91356501885.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/wazujobebodogorutebiboren.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/thtk9m199c7isrl9acpvcgtsmu/gitunoxegisaja.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c441c6148c8---25353831695.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/3748083185.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0eaf27ad2---20059450145.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/47854571405.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/55812883479.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/balevudidafimuvepefutodob.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/12756943563.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/namubamijozigibovuz.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/71041886727.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/v52urbtgp70pug4cdoh1kp4bh2/fonajusorab.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9750f3563d---2894486136.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/rigatoxivolekeduxud.pdfIn PDF document text
    • http://kbchina.de/upload/65278326798.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/27385148345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ccna+200-125+pdf+freePDF 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_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 10584 bytes
SHA-256: 43e27e4f44b0a77e1d4d8e8375fefc30a81792d66c524ac024855e638f161b6e
font_01_sfnt_off0000f1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 19876 bytes
SHA-256: d4af4131e60bbf73aa47260db32afe043702041611199be8b81f113ee5e7c3f8