Malicious PDF — malware analysis report

Static analysis result for SHA-256 072dda5eb624a7c4…

MALICIOUS

PDF

94.7 KB Created: 2021-07-27 17:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b275a99300b7838d24a5c95d6656dd9c SHA-1: e9e918259b70beaa0d36c1d958084cf7dbc00724 SHA-256: 072dda5eb624a7c45254c978c28889a52c734d1cac32aca24a5ba95e08136d2d
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b5686348---79376749027.pdf In PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607444faec9d0---kuneluzokonipizolu.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/45276377888.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/46310441184.pdfIn PDF document text
    • https://olterus.com/contents//files/nigalejil.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/23150471077.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2eff0cfd0562aa877ed6151c1b6626c7/67025826175.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/acb77041d33470bd7590ae9d5e04a246/lovepajuvarar.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/74397253835.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/gararixaga.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/35447909320.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/jurovaluwiwefibimesuvepi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4026f9f767---49661684320.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c1067b2b3---121859138.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2cd87a188---77245581505.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/37490611149.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/pagifud.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607624f821358---76956194553.pdfIn PDF document text
    • https://okna-kurska.ru/page_edit/_samples/userfiles/files/51944795506.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160abb6151c684---19557083980.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/6495b0cb0e4a5a846b63694795d54254/68986662226.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/mdo1qkukckdkqp0r4v31si46rh/bikopididew.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/49f4acf9c08f1431c853bd663c3cf0de/nekobufanamavelefaro.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c410956500---9305047712.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/88231402754.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/verexevesidividenusobaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+write+a+business+plan+for+a+bakery+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 16660 bytes
SHA-256: 3e1a5c08b99c48cfa263cac2d0fa4fd7eb77e98f3e485c9afca6077663a68f55
font_01_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 11016 bytes
SHA-256: 6866102e0b5ff125ed42f13ef3f1a7cf8e6d176aa23c07057fd1efb666fbbff4
font_02_sfnt_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 17996 bytes
SHA-256: a148c3dbfed119a632e1636c15157c7c23104402d255d4651161afeba0ade5b3
font_03_sfnt_off000151fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1