Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7c0f0c88925eea…

MALICIOUS

PDF

88.2 KB Created: 2021-07-24 08:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 28db15afebc037bf6c31f5af50cc2947 SHA-1: 60bc3f425fadf753c81967e2a87ae89456ab7fec SHA-256: de7c0f0c88925eea2f7ac2a5bdb68590faf6d8e04857727072d2b94e81865af8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common phishing lure, likely attempting to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edba80ad18---xivisumabar.pdf In PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/6jfthaujfuoie1b58c8kj9rg64/rexiza.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/pediwusiz.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/borimepaxuj.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160843b258e4b1---lulat.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/95422jmn7ged2am3jvu495kfg1/32284989445.pdfIn PDF document text
    • http://timebymtm.com/upload/files/xonawigemunitipepat.pdfIn PDF document text
    • http://healthywithhart.com/res/file/rukof.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/er0fspcvl90hgm7ss2is9qd9o7/56467349423.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/xalitofek.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/tobotogomasikomi.pdfIn PDF document text
    • http://nfc.soo.jp/file/fuzobavewilebisedilu.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/71909064365.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210601143644138958.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/32c74eedfb8fc67763f1f1703264e6ec/3531415938.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/51359270122.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/laxozafonekomegit.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/18909018452.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ecfe8ed7a---3018285506.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d842cd1c83---30494026888.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/kozekonusanekovizub.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d4fce770---85550630414.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/00n29sjdb6us61bs4avf3n4mt0/golizemedegejejuwenokop.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35e1c5c3d---sawewifekaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=store+manager+job+description+in+manufacturing+industry+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_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 11476 bytes
SHA-256: c5b9413148dc1bc500b5a042f01340957e85de8520ed1583b1f2f84942caecb7
font_01_sfnt_off00010f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F66 16332 bytes
SHA-256: 57c8abbc6ad92b160987cbbabe00a58d4902d61ba4c4eec4c0925175b92bbe96
font_02_sfnt_off000139cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1