Malicious PDF — malware analysis report

Static analysis result for SHA-256 224300a4fac40bf4…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 18:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7dc4cefab35fa48859b9f5803cf81243 SHA-1: 048203caf727d7af275555af0288f69ce9918d5f SHA-256: 224300a4fac40bf4fd5daea5153f428302964ad35032111a9bfed1cf45e38c2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm or redirection mechanism. The presence of embedded URLs and the PDF structure indicate it is likely used for phishing or distributing further malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=simplissime+v%C3%A9g%C3%A9tarien+pdf PDF link annotation
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb5777c324---nepunixiburuxekipoz.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/gorobufusevufaxowozifutus.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083fadc61d93---82891346830.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/depukoxakofugamamifi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b1000f7aec4bdad3d882f44202357ef9/70235898472.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/sesumefekadijupo.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9b3420896031af89d503fdb296997ec4/11835589550.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160760528e3e3b---faxunonav.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/galenadedoj.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/vorukediwipowasezewu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160887255a3ce1---munilaxewutabibofapilu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/7i2rpog06ggh15737m3snosq27/61482650389.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb5f92949d---visudozafujelitog.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/fe69fa77a6b10ef20b65bafaff8869a7/jevezubibaxipafafafofatop.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/98645345207.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/63935219040.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab946d7ad5d---48070236048.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/fc736df030c94ae2562c0c2534726958/xasijatofexufemokixamow.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/11667980096.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/dabamop.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/bedoja.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16107e4e317849---vivuzezekamogi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c6a4aad7---rubiwaxugudutewogodagegiv.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/kejaxadevavojigajovemewuk.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_off0000cfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 11016 bytes
SHA-256: 0bbce31eebb907d5e081168cfb4214fa03c7d15d16e82c374c22f37de977deb4
font_02_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 19744 bytes
SHA-256: be2afa92426e447c007815c21edf8066e22efe46952b2309ee1a77d691ed0246

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