Malicious PDF — malware analysis report

Static analysis result for SHA-256 f588136c816662a8…

MALICIOUS

PDF

70.5 KB Created: 2021-09-03 10:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 162b3913d568b63e8e58d5dc6437b91d SHA-1: 15552d5bf6eb04076376114fcaf7fec56b98ad2c SHA-256: f588136c816662a81eab0adc69c5aa657977e1e2d3026b5715c70d8b39e60d61
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • 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://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/814840ae7c92d4718a80563401984e38/81456183663.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160738d8f867fa---37535320631.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/fanisimolotug.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff0a1662ee---42504805027.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/golikavaja.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/kobebipudadik.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/92cf2388ade1252dfb31929d9c072daa/86964698542.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/60601613758.pdfIn PDF document text
    • http://punaide.com/userfiles/files/gatasalivuzo.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/dowelewavogax.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/86302202516.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/56546207409.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/vexidemekiwawos.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c311b437e8---nawupagefulapema.pdfIn PDF document text
    • http://dmkaudit.sk/101/upload/file/79627568174.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e6ce7be3b---64129954255.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/rajivosesidumururekanatow.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf338d519---butasibujomex.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/80706671897.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607562dd88d2a---47687733569.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/4549588370.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/rubelumavo.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/37367398240.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/menidini.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/25jbrmmimbh6vq7v8fsqh19k5t/74994737678.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/7hjut3ectclnepth69nk10lh40/mixurifadekijo.pdfIn PDF document text
    • http://e-sheremet.com/img/watomodinuzuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=vp+shunt+adalah+pdfPDF link annotation
    • 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_off0000b852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB852 14824 bytes
SHA-256: 57a66105fca247d24427d1dd74d1d476448f7cf7de018566814eb37c661a63fb
font_01_sfnt_off0000dd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 10220 bytes
SHA-256: 51889a8dc7625a96a0c17f9e1206a9a96a784aeeb4f6fb29a92dbf1676c32071
font_02_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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