Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdb8537f159a3b0…

MALICIOUS

PDF

73.6 KB Created: 2021-09-11 17:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4becd21f6b095b96fb0cfd97cb14f5e6 SHA-1: ebe907d565a47757bdba00a622db5be795237e78 SHA-256: 8fdb8537f159a3b0f7b8944cbe02ca3efa43b77736cc190d25cdbfa25f1927d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of a 'utm_term' parameter in one URL suggests a phishing or scam lure, likely attempting to trick users into downloading further malware or divulging sensitive information.

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://philabc.ru/uplcv?utm_term=far+cry+4+free+download+for+android PDF link annotation
    • http://czernavendeghaz.hu/admin1/file/zeviziwuwokewamifokuk.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/83401122312.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/92271108788.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/64625751930.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e7006f412a00287598b5d19285d59337/rajanudugexexefid.pdfIn PDF document text
    • https://nomortiga.com/contents/files/10696915995.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/gakevaxupusorug.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/43039921976.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/daxogafupe.pdfIn PDF document text
    • https://majubesar.info/contents/files/88753405789.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210907164858.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/49317297909.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/9a961843560d5c432f31d044e4c73324/34122820601.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/zabevebari.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/21810190275.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f6a960016---xawoluxusenabori.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363481d2f84---49088623671.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/39730313038.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///nuruforelovadezupezedavu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/0cbda1fd36b3ffb0ebbed9ac86aca14f/liwazalitex.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/vafov.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/fufusabirij.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/bomipulexor.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/mazusatixeguzitas.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_off0000bc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC91 10460 bytes
SHA-256: 1c4ba8534043db9c5877ed2b09de6e0539e043c373c76ff74f532ff0279725f5
font_01_sfnt_off0000d47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47A 17092 bytes
SHA-256: 3dc91a6f1728d9ea5f5f070b334e2cb4a257e2eea2fbfe53cb1ee3f4229b794e
font_02_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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