Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb391a42b166beb6…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 07:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1f24eea077d4da97a07da0cd1dc42d8 SHA-1: 5f59e6daa18cab263df8ff84f8cc05d155f3e94b SHA-256: cb391a42b166beb63a22f4312f0eab928ee7afc64d672829df46bb1428de3a7c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8af7b096085efcddf9d7be5b27f2a70b/15432738142.pdf In PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e2c819fc---95488717573.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/72079952883.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202108020253379531.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/15319831568.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/11290786108.pdfIn PDF document text
    • http://christopherdallo.com/file/fuvemexipivurilinuv.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/e23d34fd2bf69bcfee18609205df68bb/46367819916.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8c05ed193c42cbf25adcd7731a58942c/savujidulojudifuvizepus.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/tomudenezipa.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/sokokagatufo.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/o3sutjjkjgjkluah46o9nfb9l7/fobazogopusodefu.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/49864495079.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/29134708343.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/depebebelosusaniranojob.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11c3e9e2be---dorirolimezewepudugep.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/80838537673.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c19582840fa---35051507626.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5e6888673---4091478199.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610744c710e4a---87301019441.pdfIn PDF document text
    • http://fourfoods.com/images/files/robudiw.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/nivajuvodufotarefe.pdfIn PDF document text
    • http://lg-palette.com/upload/files/19116593705.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/52665332905.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8d46ef57b---baziretisazelamidojonu.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210822_050604.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/befowewofosebefuninebuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=schaum%27s+differential+equations+solution+manualPDF 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_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 11096 bytes
SHA-256: f517e0292b6e5ccc8732249a061c25eb190e4263f54f10e26f27e3265780d2ab
font_02_sfnt_off0001130c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 19380 bytes
SHA-256: f5dde9ebc5496ac1c290045500814d46805efee3067f9d85fb322bcbebdd315e

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