Malicious PDF — malware analysis report

Static analysis result for SHA-256 263c7dfb4ee1e39a…

MALICIOUS

PDF

94.2 KB Created: 2021-09-06 18:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 86cf44935b7a8088fb836e47a5138337 SHA-1: ae12a31bac52c691fb0d28475287740386edcdd4 SHA-256: 263c7dfb4ee1e39a349e6032cccbc51b636b18ed50b0055d49ff47e8f76d7c55
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 0.9897

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://cructi.ru/uplcv?utm_term=history+paper+2+notes+pdf PDF link annotation
    • http://ladyqueen.it/userfiles/files/8088784872.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/0f2f6c27eaa5df98f8e7aaa4f9dade10/dekogowelinoxajupov.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9214e23211---5477086274.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/xawojodus.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/97358444520.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726c20f09df---83130808886.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/29351108140.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609844c7c0125---pezefubidorozunefajitumi.pdfIn PDF document text
    • https://lasanisports.com/files/65380503114.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/dijoxijomodozujisa.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/67463967199.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ef19c4b62---mijolenizarujewesoxawik.pdfIn PDF document text
    • http://gdgom.com/upload/file/210710011249338160l3opa77b4yg2.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/35930552006.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/ljenule1927bqirob63tqtir2i/581670609.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/35669761404.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/hgh61rufk9775p4sv297k88p82/temaze.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16095dcc55b9bc---11235175659.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9c7da01f27558e7bef0d4a51da135431/dobumaluzo.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/fovefebepixum.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/37083915034.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/wubereruperagonakapumuf.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/4f372202156b2da2923228ec8cc552cd/68806716811.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/zijemijere.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/renumivereduko.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f5887d5d0b---56353533453.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_off00010a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 18500 bytes
SHA-256: 0dd66accf2cb794e290b70a85bb6fdfe7e474e41919d87f86fb595e6a02ce16c
font_01_sfnt_off00013a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A07 10672 bytes
SHA-256: 2b4090b733fb6e90149867b4d4497078a92593bcc749d2795014d098b5eac2c0
font_02_sfnt_off000152b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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