Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c12273d81d0b2d0…

MALICIOUS

PDF

123.6 KB Created: 2021-06-28 12:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0c84a17394e2469714bc50bcc24a057c SHA-1: 80271c24a6fe88f6587ace88cb4a8f78ed2c722c SHA-256: 4c12273d81d0b2d0cb65f9af61b5bffc30a99b04ca1576b1fc273ebd02500a71
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised CMS upload directories, suggesting it's used to distribute further malicious content or phish users. The presence of numerous external URIs and the nature of the links strongly support a malicious document lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://qa-whg.net/upload/files/37224268307.pdf In PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/xojajesojafitumagugop.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a83643ced14---94093102027.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3585b230481d1b34dc1425d1a87ee894/12723137717.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210609174525.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/00d0e35369529891d0d73ddf64d8205a/xixilofinuzar.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b901875dc17---kegadagim.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7e238afa84517404ce7a4d3ff731fa17/gufazelanikibi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fb1ca9b08---derev.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/6e47a4f700dd9f0a6ef7496436e99c4c/20494874625.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/amolq3l66jqml2eigvfmqn4tf3/4369931091.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b12c4e698d2---95454762668.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/20d33b0864e88e53f86e335f0e3e2d57/13827392129.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/basodimasefirawiziwofok.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/zivozexanegekimu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06baee78b---70559268425.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/nugibaduma.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/1f69a0c6357b7485ceb69121ea05a55f/dowovoreto.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/ferovobaxinaximakisulumu.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/kijesexifiwedomunaruti.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/1334386575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=75+cl+to+mlPDF 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_off00018756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F68 17388 bytes
SHA-256: 2570d16b78ae52e73aad326f5a5dda8e02ae6d87d5e260ddd44b1d82460f61c6
font_02_sfnt_off0001cce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCE2 9720 bytes
SHA-256: c31c48cec0f76bf4b10a029135a5124ba519b322df1f41367250d9ac543111ff

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