Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9c9b439a2cce06…

MALICIOUS

PDF

75.2 KB Created: 2021-06-18 20:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1652e62113f69de4d7bccfe8413760cc SHA-1: 7193de3571237e89c5a63e14ce2328f436d17bfa SHA-256: 5f9c9b439a2cce0638bcf5096e2341cfcd9960f5f3a7cfabf65b8614de75c209
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm hosted on compromised WordPress sites and disposable domains, aiming to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of multiple embedded URLs suggests an attempt to distribute further malicious files or lead users to phishing sites. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://mygoaltv.com/ipp/images/uploads/files/savawejenizunafebug.pdf In PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/surowuwunexolaf.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f26db3653---tulavimumupasolasedibepi.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/tufarijud.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/39554810009.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160876fe2f2c17---78551646108.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/98218753337.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/wixoxijigugebezenu.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/84adde738d50390940f1fe710526c2e5/26328271205.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dc64eef97472886a9bfa4bf736d9d168/selomowadunabaz.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/075f10e834a73c3a2a1bf33cb3e3d5de/97395363664.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781cc659424---84924298528.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/88214193186.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/90782224997.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/sikina.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b564f2d468---zusopinerudedowemur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=fortnite+ps1+download+pcPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FC 5164 bytes
SHA-256: b47d77903adc57b64100e36949f6d797b4d3773b7c08ba0dbacaf68561f8dcd9
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 11740 bytes
SHA-256: 876449d825de510329d6b0a1a8496f75990739e5e14c26a4025e583d15f45142