Malicious PDF — malware analysis report

Static analysis result for SHA-256 9890808bc90eeb95…

MALICIOUS

PDF

77.4 KB Created: 2021-09-01 01:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: edc713e82d451527b532544d6d8e5123 SHA-1: e0a0dfd2d3f2f180ec99f45c21e2412329d5cb25 SHA-256: 9890808bc90eeb9516d422aabb2ab9e8ba3f9b51e794e56bc5bedecea9d60a53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://drafthe.ru/uplcv?utm_term=dairy+and+mucus+in+throat PDF link annotation
    • http://helenhotel.vn/upload/files/nadagojiwumeluk.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/73507811780.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/vamaju.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/8318691565.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02e994d448---87806906899.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051716195273499.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/i3v0k03hbd4il9d70tmoa1ntk1/zimokupunat.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fac77c3a169---87910763277.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/0521026da751a2c1dc9d2d747fe57ac3/28003970462.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fe1e67aa42---gavusirimuzaxeti.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/fanizega.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607602e8104d4---vorep.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/pokotikoboxijegeroma.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/7819949983.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160caff9d4662b---67525960542.pdfIn PDF document text
    • http://kezheng.net/Upload/file/76919221085.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ee21dc835cc---livakizusozozo.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/6kmvp1qr3tkh9i1i24fqh2jr11/92238838849.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9981b5a4c4---kowufexogibojel.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070865b5ea17---49178564501.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/dh82v3mopondoc24jl0jks77oq/zasigobirakenulepodedik.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091190007cc1---81071774987.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071de10e33ae---23328941482.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/8967992167.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075f66c089eb---35202210286.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_off0000cbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD1 16796 bytes
SHA-256: 18e81ef3f8f2dd7b2b45a7e73a9649b88af344dff71190ab9b79ac31790e9d08
font_01_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 10672 bytes
SHA-256: 7ba878adb67b8e3f1bff2b980f21cd3263915d709b1b6d14a7ce6686dc297c30
font_02_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1