Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaa5e71a3316710…

MALICIOUS

PDF

91.3 KB Created: 2021-08-12 15:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c27607a110c34c5c7d9f4a7beb33c847 SHA-1: de4acc1ccb6887856f582348624b164b2d9cdff6 SHA-256: cfaa5e71a3316710e48416baaf785e580344d71402aa46550d879efdfc53faaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://syuncyoku.jp/upload/file/sumufugekexiwefifat.pdf In PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5b40cfdae736b1ac80edd9a4c34acfa9/wivedutokobedoxikefe.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e594bbddae---rikiwakamotikomuju.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/031d47bd1ccf32be4d2eb34b26c1362d/6037174193.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c849136652---kidebitijamawekiresus.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/ramopugewubisimezamudud.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609082fd7c4cc---47348289003.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e41061574313e189ffa64512425f0c4d/95155469277.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/nojotamobufonawarizifo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f93500f5d8---28517692857.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/zexukorininibuk.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/mivulikagejesupatipesuwu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0672600d90---46712409814.pdfIn PDF document text
    • http://halmar.info/userfiles/file/kezajaru.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/88909626050.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abd909cce21---54705554739.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/wesiguvakekelanak.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/tatabimewunukuruji.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/54691730126.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/32931268149.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71bb33f2e---vojogodesibipaxopenaj.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/60306734800.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f163033a088---doripekuxaxuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+charge+air+hogs+axis+200PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 10780 bytes
SHA-256: 4c8e85866ba4d6054785e8349665688f10944eb815519a9d3c5e4be52d8bb4c8
font_01_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00012808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12808 1720 bytes
SHA-256: 9c3c50ca7885eb1b87261f6f74ba185aca171ae216209544253fbc3ee3acc073
font_04_sfnt_off0001302a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302A 17244 bytes
SHA-256: db0fa0818889023b356dae508337398276a2792338696b902b8812cd5a4729a5

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