Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7938ddbdb898496…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 23:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 512d6a61c31ac701bdad034c5ebd49ef SHA-1: 498ae1f53cc79d79bfe73ffdc007bce05780a10b SHA-256: b7938ddbdb898496f0ad8de3924ad59d68b2f4714a64524bc3d217354fe53bdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on compromised hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/wesixilepofivatate.pdf In PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/zuwunikasejetokeleb.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/kinosov.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/40731455821.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c12d3892ea8aa7d2855f3cbdc862ce30/37488836829.pdfIn PDF document text
    • https://mimpidia.com/contents/files/pesolazapedivadejeza.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/daferupagononidakupeg.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/3kdto4f0v67n6p44rkhtg7fqoq/ropepufoginodavarukizono.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/82452071541.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/3965672397.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/nujutisaluxufowuzemofipob.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/e19d3bcacd34db2daef6e35aea099db3/92780300350.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/82283232561.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/eq2s21iqo1gajl1l87qlkgkat2/95396986443.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2157a718501c573b7c246f04d1fb1f32/25561069362.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021073008412865.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///56988112996.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/sakori.pdfIn PDF document text
    • http://robedecreateur.com/img/files/48911733732.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/88212959475.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/mulax.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c03161d8a---lilubamu.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7612da80a---79444744446.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/65985686354.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee66ef6af41---riritebuzatowida.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d0dc79d4---serofuxavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=thermochemistry+lab+reportPDF 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_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 18440 bytes
SHA-256: 240a8fdc78d936837a205ea2c422f961c2045252c631ddad70f19f5f3099603c
font_01_sfnt_off00010f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12718 10752 bytes
SHA-256: 6f456cf2bd86711446fbe642f989032efbca9d41a7a14d561391671f5ad97fba

Open this report in the interactive analyzer, or submit your own file for analysis.