Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f4828d9ad29a15…

MALICIOUS

PDF

88.4 KB Created: 2021-09-01 07:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6011aa62255320f1e9f2bd76e358feab SHA-1: d09b423431582e09e6907e175b51a928172ce290 SHA-256: c4f4828d9ad29a158322deb0d42ab6617e34dc779ec4be199696d3f31fd91a1c
196 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://iberryhomemade.com/userfiles/files/52497476243.pdf In PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2480b039e734b755451d36e2be4400a1/sibotikajedive.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed7ad25890---57460478266.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/pewegebedajejikaja.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/71393353711.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/f7sp41pm9flhlfq0f5un2j0sok/28413831146.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb7f91976f---44572707056.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160aff8e3dc2a9---vofisogigik.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f3fcac644508805a376816018ef91b9d/naxufomirewa.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/7a0e9f67896b20b014143be7866d0f2c/14214422588.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/d8kpp91pnb9uhoat7cblhil11k/powupomibediku.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc38dc7fb33---zigivoko.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/22367062255.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/vikiwinitodosutijunope.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/p2s5p4jscaua4o9h8ro1io6tf6/doxudisunepodenilete.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/46967390815.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/97599981734.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/48025801196.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/86645425675.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c87e85aa03b---67624607304.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/46254471029.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/30/48643771764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=snipping+tool+on+macbook+airPDF 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_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 23168 bytes
SHA-256: b9de3f2ef32c62d0398d6c9b51e8770bef67e9241b61d27d07ed7226ea3015e9
font_01_sfnt_off000121e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E4 10724 bytes
SHA-256: 37f5801afff7e6da81d53bf49745b9e3a071668c6b81e8801c962fb382d66c2b
font_02_sfnt_off00013a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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