Malicious PDF — malware analysis report

Static analysis result for SHA-256 da921a91b99b60a1…

MALICIOUS

PDF

105.5 KB Created: 2021-07-16 20:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bf0d21d08de26eac04a4f32dc0c21a4b SHA-1: 64a06957cf8922e6facd4328bbe72124b42b2918 SHA-256: da921a91b99b60a172bb1b6158e77581cccf6f965f25ac921615eae679aae5da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted from this sample, but the structure and heuristics indicate a malicious intent to redirect users to external, potentially harmful, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://mut-zur-veraenderung-hambuch.de/userfiles/file/zebokudibabo.pdf In PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6e85b28c05b00096ac2e7c2d68189060/46370721617.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52402740142.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa9d6a7b3---zujekofugadivugo.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ad72c8061d434b913a7ed845b42a12a8/kovow.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/96s7t3gmumi2pij3dflfmc6jb6/bifaj.pdfIn PDF document text
    • https://cecprint.com/images/file/kizaxijagipunosefimetuxi.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/36818164310.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/ravis.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a59479682d8---fitewowud.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/14731338785.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e20e2de1242---kunufapazafis.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/nagamuxovalozisasu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/jdvc37osqhiff53ftq6ttthb80/26203804287.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/7f1eed36a294cff055cddf78d4178982/26312166596.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/43842907887.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/8079178455.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bbd172653---zawerakexawapezu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d15f83c8c---tewesokuxuzajetapudora.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4261ec07e1ab6886b60412cd253297d2/dobasu.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099602f19e48---mebosifigazexasitamugalap.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c150b318ad4---bubakukozujim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+book+of+galatians+pdfPDF 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_off000136bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BD 10872 bytes
SHA-256: aa4f59239bea1f31e06aae0809c89ce353db16e73820036afb1ec5fe6cc0ef10
font_01_sfnt_off00014f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16779 18948 bytes
SHA-256: 7e00e9d5642eaf9ef29654384a704797b47a54236a33a98b41dbb62da11e2c37

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