Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01884dfd0894c6c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 07:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d0726d8cd0e14aa4c3607cf848c6c221 SHA-1: 6abde8791816db332a559450ca0cf429eff87758 SHA-256: d01884dfd0894c6cd17959c6dca7beb341957d132cd4ed01aa7a1b0aa49b51bb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. 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 0.9980

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://garglob.ru/uplcv?utm_term=pdf+file+reader+in+python PDF link annotation
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9126ca5f6---37707352161.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608235cdb9631---ribedetetukisog.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tidafarupux.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210830195705973270bxl6b.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/81v28lmgsdnmb3mobv6s8qh928/21987621185.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5dht4dlgg3osv3fuba2omdci50/78701844170.pdfIn PDF document text
    • http://rilta.net/userfiles/files/parofilu.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/vapinulivujezekategib.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/15466098495.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160739ee100eb0---58629604896.pdfIn PDF document text
    • http://cabini.it/userfiles/files/fobusozenupegisakanogekes.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a89519d7b6a---wigavonelogiwisefereza.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ga1j1poc48pqij7fna41fl7bc6/tapotegivu.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c3387ceb---28282403979.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/85297482621.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/45514886933.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/lifijata.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/accf41ca05c58d4c8f7514662d6fba96/31859438190.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/ba0842d5d1d87839fca2c4626aaacf92/5354282143.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9821d0caf4---31559064510.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/majivisepuwinogujefelusu.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/bojezojep.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_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 21968 bytes
SHA-256: bb66c5152d2ce280f0bebe4b0e56215ebe22ac26644beed5105f244e895eaec8
font_01_sfnt_off000113fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FC 10544 bytes
SHA-256: 8507c9e4cbedd98b3ac21387f0b71a8b6fdb18eba3bc44fcb94104e652bab4ed
font_02_sfnt_off00012be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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