Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c7e9e2e8972e5f…

MALICIOUS

PDF

96.7 KB Created: 2021-06-30 09:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3f4219e7657a14c9bad6e8a4e8aca5c2 SHA-1: 17f77bc5001d2f7dc20478dca2b76159c1455974 SHA-256: 98c7e9e2e8972e5ff1e0b7a98a6973c2e3fb4af511fd53aeb4f4cd05fd543f88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting further PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing additional malware. The presence of external URI heuristics and link farm indicators suggests the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://philabc.ru/uplcv?utm_term=the+lottery+written+by+shirley+jackson PDF link annotation
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a44161b8ec8---furig.pdfIn PDF document text
    • https://pindimana.in/uploads/file/botepisotekef.pdfIn PDF document text
    • http://ozari-ua.com/files/file/melaxeke.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160839f898cf12---zemuzaxunefeletadazikavus.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/88749076987.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/bunovobajexop.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d157666b6---pudexizozog.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16071caa0e36d5---nelonuvatazegigalewij.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd5e3fd8a90e4e6070cf72d8b9a61f7f/19328321287.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ccb5648305116dae971b295baaba6caf/81282636558.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/18626458298.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896854b26aa---namorugoligazozuji.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4b4f248cf84c95647b314f5a9b013810/23484721118.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/gajotuvadudufepifij.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19a22a22b1---muzelutuvixonimu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a84bb7f12---29154917664.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed65178252---genepizidalebixisewijod.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/0ceb6ec757ee8ed4482231a3ee4b7ce3/dafudixukobepazamezil.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c26a6cbddf878a0c8491d53253f4c226/4580383248.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/wadukapobibozajopebe.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/65489301952.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ba1702063---78857786583.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/95066f82a0a0e90a472fb6b11ec0ae01/setotadugovodirawimamerip.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sunatogewiferefisup.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa53b9d068---18953850785.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/19384804121.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_off00011749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 10852 bytes
SHA-256: fa546e6bb9bbf04d2923e328c2d290ee3967ff2218cbcb06762874bb8a50f154
font_01_sfnt_off00013062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 17144 bytes
SHA-256: 62c034cf0be654a9527000873916ce6571f98d0ae5a907e904d8b450f075fc14
font_02_sfnt_off00015d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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