Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe2cf735993b1f9…

MALICIOUS

PDF

86.4 KB Created: 2021-07-21 23:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d511afe100e38846103ddac6d4b83ad8 SHA-1: 007c5911ddb3ef92a27a9e915a9569ec9ea0ecaf SHA-256: 7fe2cf735993b1f902c7a292c14f2a8032e0f26895aea4fc37536e7c5e76f49c
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised websites, including a link farm hosted on disposable domains and a link farm pointing to compromised WordPress upload storage. The PDF structure and embedded links suggest it is used to redirect users to malicious sites, likely for phishing or further malware delivery.

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 https://bancodevida.com/bancodevida/admin/images/image/file/lurarazaleriveti.pdf In PDF document text
    • http://www.euro-fly.eu/userfiles/files/34693160793.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/97049580282.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/63393496559.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/52985424243.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/nosagelemurazi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af576cd54---sosawikugas.pdfIn PDF document text
    • http://akhsmombasa.com/clients/861898/File/85685944286.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32c8abf56---negujixabunajazukol.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff474f720---pinanalurivogufodakulu.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/dujibamiruxusumawedofoma.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39ecf8fd06---zebuva.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/kabimiranazivopinuvutizog.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c4addae5423---mepitemizo.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/ab3d74927854bb593fb49108eeec6df7/xudanaginiwotisitawowi.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ebf7a9faaa7d7d14d0dfada3fec39374/godogibojibogifom.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/36328327562.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/88660632869.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/13415519557.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/99035791418.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/gakegimunufupajiriliroxab.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/7e82bfe74b515fdbba5ec6ed769072c8/fatejaremurogezuz.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/taxax.pdfIn PDF document text
    • https://businesslife.com/content/file/xaxorafokupizenoxituga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=effects+of+seizuresPDF 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_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 16540 bytes
SHA-256: 464e24c6f9dc2b9acf85d2669409b16190ec01f78cc04e846b6b1fc406533115
font_01_sfnt_off00011ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 10160 bytes
SHA-256: a8d6c2b45fe5b3b30124da40a82fd6abd0172841015adb48ee87dd7ca3b4aa7d
font_02_sfnt_off000133d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1