Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4eed776ae0e694d…

MALICIOUS

PDF

101.8 KB Created: 2021-06-26 10:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9dd267435098f9d2c1e4fd550b082f75 SHA-1: 2e4b111a6244a6bd899a11a2588a452efe364651 SHA-256: a4eed776ae0e694d0f23a2ccc95ad7be5cf9a59ffef740426bcf5ab39eda9d29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations used for hosting malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://medvor.ru/uplcv?utm_term=pyridoxine+hcl+tablet PDF link annotation
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6032d648aa34485503e6e5e4cac09310/3819527434.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/55513762099.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cab70c72c70---73377911880.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/42ol4q2r7qb8tqd03brj0khvho/26673577542.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/bedukawowofapitebutonamu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6d93429d0---41324291163.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c867fa090d---pekubodawabemejaba.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab678e43669---32590733740.pdfIn PDF document text
    • http://kbchina.de/upload/32354789928.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf094c697---kajorejapitelufofe.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/mumuxubamogejevizakone.pdfIn PDF document text
    • http://zuche0551.com/upload/file/44160546484.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/fupirugoxunegekopose.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7ecbd800a63424fa04bde92fd245867d/virunaligoxujepivone.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c474fb1825d---84213922207.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12d907641---8637218064.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/75206866091.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/49b8815a39c8f0854dc2e1313f20e768/gewez.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/jogawitulivelamerejafifuw.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609629b4e55ef---94252976432.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/81979124079.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087cbb3f0556---55126262609.pdfIn PDF document text
    • http://erex.hu/upload/file/zinomosafefoj.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/6ac2da2142ccce6f8ada8cdb2020f886/kureseru.pdfIn PDF document text
    • 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_off00012674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12674 10656 bytes
SHA-256: 38dd0b38225dc8ecb765a148c372d332b5501ad3da44ddaf135a48e26c0df927
font_01_sfnt_off00013ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC6 19672 bytes
SHA-256: 3ab09676d01cbdc0823d70058a667533b054c0d5f4aea3eb69c3e66a09adda94
font_02_sfnt_off00017233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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