Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06c03348208c424…

MALICIOUS

PDF

103.1 KB Created: 2021-08-03 05:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7bab4646ff2e69a22e2f20b88fd59dd4 SHA-1: ff5b609d073800db768eecfddca2238c9d19b4b7 SHA-256: d06c03348208c424d8ecd9085e79d4cf8d16e43d426324470f8b04f3b284e8dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=los+temerarios+grandes+exitos+descargar PDF link annotation
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e74796ce74---risepotiforiwenu.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/31827621537.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/mutewewimujob.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/silusibomaxaxumurepes.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/89597518348.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/sepuxuduvijupanu.pdfIn PDF document text
    • https://masihpt1.com/contents//files/4325092843.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/86139500909.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021071816163773499.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ir9aub5gl8r85no7n9tvafhd0/kugipilog.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e75eae6fd9b4867e5438611b0d999ab1/nutebas.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a632e865c---towewegeze.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210626210749_da69eu.pdfIn PDF document text
    • http://erex.hu/upload/file/16486967817.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/meviz.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/915409aac2fb83952378447f65a95f5e/nexawapipogusedamamodawo.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160774f33be25a---40318648020.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210625_35DBC1153DE69EB8.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a469c17f1dd25576e5b395286a192470/wukizu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606caca4de718---xitasumelebogab.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/par8eo1jvgah1l2sscdc7pcgo7/jomabikimawexatagexowe.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/89344416776.pdfIn PDF document text
    • http://soupworld.de/upload/file/zexexalobibekop.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a80586c15652f48d161defef861933bd/zixazitajerosakulola.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_off00012b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4C 18688 bytes
SHA-256: 455f8650999b7a6572c38efb2e3f3734666c8723af735f41944c588b845cf713
font_01_sfnt_off00015b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17354 10728 bytes
SHA-256: 15648efa4ff425a0783a5acbc162824269b10f3784c63258aa9218a4212c1479

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