Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09ab8db4a536fe3…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 08:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fa3886737acf470938cf939a70daefec SHA-1: ae84ac8c52b0b533094b63f35fadc4889376af32 SHA-256: e09ab8db4a536fe3841de4534d45037fe6a6321bc49476efd6974a3fa6055d88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous URLs, many associated with compromised CMS uploads or disposable hosting, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=integrated+chinese+workbook+2+pdf PDF link annotation
    • http://beautybybelief.com/admin/images/file/paxogi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/464de342a177a9ced83b3e6bf5410a38/fatexosidiguk.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/2377676988.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825fd0a156e---26107989546.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/9a58a8595d7f94bd24495c3edf8dee1b/novepovogabezo.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/97748418532.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/14033509903.pdfIn PDF document text
    • https://masukpt2.com/contents/files/fijesu.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/cs52prlu0bpn7i5dcm9aroka43/43671367039.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/61016176633.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/3el0mqtq2vohjgomjmifik6skr/jajepalisitatu.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a7dd235c0---54693990694.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161198000e9f27---89174002818.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9j7ve9lnafoqfi86qi9drkgick/22779187670.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16113806457f81---83902134378.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/66715566557.pdfIn PDF document text
    • http://etre-belle.su/images/file/donagupilufin.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e3991342fe9f6ebf7bfec80074e603e7/fararutosuloteriragik.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a44855bb94---65412971268.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e738b3570---jamolapirujo.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4cc6f76fda24e67a05d89555781d9d95/43585557404.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/jolowuxususejotaw.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_off0000bb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB67 11240 bytes
SHA-256: 20d08d42d127177e75cfe2b8ba0c7068864c34d35eed3ac2cc58e2c2bcd24439
font_01_sfnt_off0000d563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD563 16728 bytes
SHA-256: de6110f2514ed4637ce6eb2060a1800533fb6a692cebc5ac3c23767cb0e9a4cf
font_02_sfnt_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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