Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d1bf13a14c4970…

MALICIOUS

PDF

102.4 KB Created: 2021-07-01 19:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8647be1ae22dbaf7c72e8e5f943db606 SHA-1: 18790e34f2d647670c335b9aa24e3bf1ee560fda SHA-256: e5d1bf13a14c497025e3e618bf1fe2bd63435a5f948982857d54a6967b17be17
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it with high confidence. The presence of external URI heuristics further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/be9142193572f7daaafadd89821c713c/39623152032.pdf In PDF document text
    • http://beautybybelief.com/admin/images/file/tuwikizofumakoj.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3dad1db804015ca6503a8514c3772666/lamatasaloxe.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/31753926475.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e43d534148---60240467075.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087450dbeff9---59421711061.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/91217319445.pdfIn PDF document text
    • http://wamer.org/userfiles/file/89329438591.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/dusibibap.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/rapugadukavofebojopumabi.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/9897309753.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cb007c096---gaxolizaxuliva.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/66616d6e2cd629238ac1d736ec9ee66c/dazokabisirarozusipori.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c7c9df86c---vufudugazozubuf.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/60697001904.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/294800420ffb8ff0eb3a050ec5a63c17/35387767286.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080aa9399c93---kudewipati.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/kdhtp78uq4glh10aahskn6agk0/17530461364.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf25e764518---52155164213.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/00fa45824a34deec7187b0720b15cfc4/rurozuxutelawufopesinox.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609493e77bdf5---kakukodivarix.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/dc4bbb6fb0708ba383da35d0bef28528/81228954569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=natural+resource+management+lecture+notes+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_off00012eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000146c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C8 10948 bytes
SHA-256: 7c0c7ab7492d5c6159e53053fffa90d00d1a423f22d16587943fb911b4b335b7
font_02_sfnt_off00016003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16003 17220 bytes
SHA-256: cd7ed005cd60b2f16b16e6560342421664dee315a3b3644eaf16c9c2d9ee2de1

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