Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35bc89dd7519a59…

MALICIOUS

PDF

94.1 KB Created: 2021-08-30 22:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 24da6525e3b17e02c6ff35312b2ae52c SHA-1: e76cdce9e9de4a2edf9c86e296c1d2073f730759 SHA-256: d35bc89dd7519a597be69d745214983021a4673597bf64786d4192198639d09f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smartvoicecom.com/userfiles/mekivanetenufo.pdf In PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/30681997182.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/77630538053.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210728174136.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/15209568592.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/11ba59af4d43798e026558f109d402b3/44670575503.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/937a957baeed0c83a4a6107a7f9d6b4e/95104497526.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/24064398431.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bda46578fac74cff769d8e857f52f4f2/kujunepawedojavukevix.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/genivoxijon.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/9eglstdtdm6grobrbf54cgq0ob/gijaniwononegeji.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16084373319bfe---87620691762.pdfIn PDF document text
    • http://chikatere.com/Upload/files/6180073370.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad424b87f3---fefemikevebomexaj.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd744cd6757---daposifaga.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/49493958953.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/26008781200.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/dugexorunubasoxepepivikar.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90284566005.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe2467da4---1778774281.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c77601794b88c4b4a7677242b357653d/19430370701.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/7o7qp3169ldmvmahruoh3qgvu0/fedov.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/27138148174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hiring+interview+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_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 10764 bytes
SHA-256: 4f5829b5d369f61b9f13a11577b90c9a4c3bc75efc0388e189dc4cac68103af3
font_01_sfnt_off000121d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 18564 bytes
SHA-256: b7fa014c64383a1a3cea2879b7659e2c3e92f7082e97b0cba528f59e73ec9c93
font_02_sfnt_off00015160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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