Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8049e08e7ef536…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 20:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b22565d743172e9856ff721a494ede5a SHA-1: 808fedf183e8e5a426be093af294c5c8af32d918 SHA-256: 1d8049e08e7ef53667a536bc2e6a8e3f7def5a2ab7ad521ef2fcfb9ebf42c1eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of the document as a link farm on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=alexa+app+for+mac+os PDF link annotation
    • http://wskinbody.com/data/boardData/files/xevuz.pdfIn PDF document text
    • http://alkanboya.com/files/file///39722030082.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/53182112860.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/lisilivuxurejiwiweto.pdfIn PDF document text
    • http://maintogelonline2.bet/contents/files/38331250839.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/boditaridimirikomozi.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/32345277072.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/fimunejisira.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/guxufobomafiwipos.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1a124811a---91547656772.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/78666418378.pdfIn PDF document text
    • http://alkanboya.com/files/file///gibowegutavakagezuzuvota.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/34341396328.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee50363141---67509421812.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/pafedajufawikuzugivove.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/sunodatok.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6ecea910b---82933875686.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/tosukumulamuveje.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16134d84d02ad2---11980715214.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130f775e1183---lebenuwadetob.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1eacf5c5921533cced61879ab0ec02f3/94744978675.pdfIn PDF document text
    • https://maviet.vn/upload/files/kinivujetojosajubefinetas.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/kavakaridu.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/34482540810.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/wibinomiv.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_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 18204 bytes
SHA-256: d8ea7f60340215498089cf66f7ad8f95ec45130725f74a9554168e78a60408e2
font_01_sfnt_off00010d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12551 10432 bytes
SHA-256: c0047e9efe16891389bc15b0b9851f723a2c67334429bb9068e2a78a85018952

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