Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddefbaa872dffced…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 23:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb1f81329b4a00d4a587e00bca329852 SHA-1: 57cada01ea867a2b7bccfc65d48691d9280f2138 SHA-256: ddefbaa872dffcedf2987a3255dd510f795a06057a495d4e38a8ec83a4934410
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting it's designed to lure users to malicious content. The presence of these elements strongly indicates a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087b0622e34a---tefebifitiripujitu.pdf In PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/54497912180.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160821de58608c---jamiridezatigiriluse.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/07de67c792b6db5604daa4893769cc1c/kaxemifazajomidesimukuxid.pdfIn PDF document text
    • https://www.dars.bg/ckfinder/userfiles/files/44319916082.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/reurpt67tuk2fef8rme9kpo2g9/64127095909.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/tojubutusomarot.pdfIn PDF document text
    • http://gibisch.biz/files/files/vovujupezuforuxede.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/fiviretawurodusituvumuj.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/54923637956.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c4ec33ac7---kepugabovawapedeva.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612d66f51b525---valomunigasizuvuxanigu.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/dazoxoxopag.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/60028890412.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/guxazirotikaxakixatin.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8643aa61ec---74449044777.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/e8e272ecd4d6d6846e7764f2fca5aaa5/biropumup.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/vunumibog.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/48080808501.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/15663356702.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/golewetuvusulelufo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501072934270218.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/5b2161af2426f9a278bb5ce6a8a8b4f7/banatapisewomiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=upstream+intermediate+b2+test+booklet+pdfPDF 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_off0000d37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37E 18960 bytes
SHA-256: 7358b4dafc5520284af6c9958d47278137ac924074db6155ae4a02aafae9015a
font_01_sfnt_off00010467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 11016 bytes
SHA-256: 9b1bec296595f10c35fc4487c8aa08f6bd5349fe7daaff6079d867ce22472b7c
font_02_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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