Malicious PDF — malware analysis report

Static analysis result for SHA-256 572c2fd2e376727b…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 05:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37d1e7b51d850273d94b34fe83b3927b SHA-1: fc7fb2dd480dd2150c6d3385331dabaae4daeb6a SHA-256: 572c2fd2e376727b62893769769cd7b8f54c9bc638192fc755b6b80c3815281e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to PDFs hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/mebopefigigoviwoxog.pdf In PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/02b1a68ee670a1966c2a597ba787540b/73698932542.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/lijironuvaxasafasapalawap.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/mukupisumitexalofudufifig.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/81255356699.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc709e5f19---wogozijenukulipi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea0ff1d42---dejibeterikopo.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/94921246058.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/radumopideviwajolixixize.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/8478827213.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/mesixokunipiki.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091817212834.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/39498430695.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/64990503103.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/95494558412.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/jovorutitareripu.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/23904724513.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/35572915558.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/xobigadenojagubadevagumew.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/52318052102.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/tazisud.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210915_180657.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/zerupejijivigapo.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1356716580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=a+quite+place+online+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_off0000ca5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5C 16560 bytes
SHA-256: 34d2818024394f12da265398eb98f7df706b6c16c90df920256ac6fcdc7f81c0
font_01_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 10532 bytes
SHA-256: c501be71a84ce1af84e41a37243f44ae12eb78958dd663da7ff0b5d4b821b7e0
font_02_sfnt_off00010d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1