Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef85637e579462ec…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 22:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7820f35e59561a9f262dc1e798baa4e6 SHA-1: 050e1f7b2008d4e8637babfad8dc6c67b3875ca5 SHA-256: ef85637e579462ec7e2806b12b067f1ad461672a6919c703a1d026dcdbf61bcc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links and the nature of the detection suggest an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/51056240823.pdf In PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d885d73547---98807258376.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ajg5435stdtei423gtf4a88574/20311436347.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160994c867fa9b---21407294436.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/98692904880.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/parodigozubipob.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/crrgiv4mjsh3asulh0i1c0l2ld/xoridadolosilizagejeni.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a7f633f67a9ec4c6ea28c9c2611fff43/12317027191.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/66056087714.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/77688911267.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/17165538075.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/zejorolapegejot.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc15217fa54---89003317499.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0e5ac571a---wilodibirapuduliwodedap.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/20329572477.pdfIn PDF document text
    • http://alkanboya.com/files/file///85792400538.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/gikekogufoxap.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/wiwixi.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/rebirawesivaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=stages+of+twin+flame+separationPDF 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_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 10860 bytes
SHA-256: 3a1324104b7a478a3aa15126b4edfcdc0d44c24ec4b6463ade55ff5567e48656
font_01_sfnt_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 17636 bytes
SHA-256: ef857d6d9e3b9567663ec908a455d75a06514b0fe3f101a53b92bf22a6c3883f
font_02_sfnt_off000133fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1