Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c225a5fc347b93…

MALICIOUS

PDF

86.1 KB Created: 2021-06-27 05:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: de66559d480eb1b48af9d0d3bce7a1c7 SHA-1: 07620948990776ed59f879f760588116d3026ad9 SHA-256: a1c225a5fc347b93999f28c956401fbf747d39b8e85461684afb6e88f7a04bdf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, which in turn host other PDF files. The primary purpose appears to be directing users to malicious content through a chain of redirects, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://lncxjzxxw.com/upload_fck/file/2021-5-31/20210531161316456930.pdf In PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828cf8f0590---tidewafiwi.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2nvfje9301b4heto3dgmv9vscf/gedutugisuna.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f22f888537---14459879439.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ule6vhnlp2qo8r50pub9jtd97m/62620747136.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7c69149b9---24817709671.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0bcee430ca08d4f0600a64213f04cecf/35856847885.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/37065166808.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608286e8d2b2d---fozunowa.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/kapakifisadujuwozu.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/79202055575.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b490e0086---silam.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb357650ee---dexotulozarezararobumazi.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/cf776987db27fa7ddb26bd49718451e9/ruburi.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/090435585472.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/tisatupo.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/nejafixibo.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e8d59ccf---26137675081.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609254a1a8d61---biraripiwoxotudizojed.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ab5a2214a---6313129622.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/vabaxununoki.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/48628910622.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/fasekoxizapasorimupisum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=icsi+questions+and+answersPDF 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_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 17276 bytes
SHA-256: 69377d98b9e86bfce3417af37cbf3c82b78c3afeac91f49ecd7be78986b41bde
font_01_sfnt_off00011924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 10600 bytes
SHA-256: 7b1ca9e9211039a1e2e12c63ce15e972aa28c062acf79644ddc5f6bb0f82812a
font_02_sfnt_off00013163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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