Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2806cfac5f6967…

MALICIOUS

PDF

93.8 KB Created: 2021-08-02 08:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c2802efb3ecfa6aaf400e46baa658f2b SHA-1: 0f5b3ff9e0d52c60dcf209d98053dbcddc80d628 SHA-256: de2806cfac5f6967aa3994e4c59e047244f8318e95b2e7cf2cd58431a6648680
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or other disposable hosting, indicating a phishing or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://infrive.ru/uplcv?utm_term=how+to+adjust+liftmaster PDF link annotation
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/78643090337.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/95408772244.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/38899754777.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad883e46bb3---mimidunuwuwawizak.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/tuwofilofavibosapos.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/39600bb99a1527ee4024a458a023e952/xuwazolazofonixajesowa.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/1247720572.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/kodemaboka.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/lerunivenukewi.pdfIn PDF document text
    • http://groupkaishan.com/d/files/rimidozirivamutuwus.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/meterogitidirekevamuzibe.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/80191337957.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5d408b4e---12117020738.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/fc020ba25fa0aad01bb2b27a48720f81/lomipubumilirova.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/18136941120.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ee082451---lafagimenukasawaluviwurex.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/luwusoj.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/7d2b8eaa6d65ab025d10e201094bb382/zutenewewetojitovupufolen.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/60593166581.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/82446956677.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/nawunamenonavafotul.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/cdeecb17b032dfbe3ce9015abf699b18/81233423245.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/xedekivuwelaf.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c9319ec2d75---29645112332.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/80178235012.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_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 10716 bytes
SHA-256: c476385670bdc2cf537c9789f13b34f2a2405de437a1d44d5fd333a585d5937e
font_01_sfnt_off0001239d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239D 17720 bytes
SHA-256: 272e9e940c632c029b07a502ff8a02343bd0a7c53177acad26aa036e48043017
font_02_sfnt_off00015223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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