Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65e445d5e7733ec…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 07:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a8e184974baab553193f99b6f6cffff8 SHA-1: 5f02246c637ea768623eb3b62b14d4438266a6a5 SHA-256: f65e445d5e7733eccf9f79ee9dfddad131d7710b2d1665c1d6de1105734d53df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf6f6337c---rofejilit.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ebvd52o6od15jamfnmqj4uv4vk/zaxazanele.pdfIn PDF document text
    • http://idaskitchen.org/clients/d/d8/d86ca706a5600d452cde81e4a21b2d68/File/memenijeb.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7cb967414---98181390676.pdfIn PDF document text
    • https://actorconseil.com/files/file/72845818506.pdfIn PDF document text
    • https://seger.cz/userfiles/file/jolawaba.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/85697852502.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/58145946713.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79d206215---21352158990.pdfIn PDF document text
    • http://abpaluso.com/upload/file/tisogapili.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/lamiganagesawe.pdfIn PDF document text
    • https://schmitz.cz/res/file/daxefibikuferile.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/28567025333.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/cc685f0295a3c3e6f9a8f2f2a73d5305/zutifuv.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/rawuguxedakeku.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/31e2ea9be5c18cab6122675fc94ba351/7994517702.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e1088a1a56402860fb8b2c292bee66be/boxuxesujeduv.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202108211142219706.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/453e9db204ed1c400fb0a7fb6953278e/nujadonagivenejo.pdfIn PDF document text
    • https://lecachet.fr/docs/files/41674134825.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/02k4ih2r4ggiilj9vufsafecq7/63057818557.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/52402545155.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/80499251740.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6d846e597ecb971526a1c6e03e6613bc/69689104510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=reading+comprehension+worksheets+pdf+grade+7PDF 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_off0000e0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AC 17068 bytes
SHA-256: b1ec8aa8c033088d6d6507d4cbc9699229ff24908f02311ce3239f3d84682e06
font_01_sfnt_off00010c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C80 11292 bytes
SHA-256: 94ee05d510ba215c16fc8a86d5fd4da3a8ff9b55e5178a9cc19d00b4f37a6528
font_02_sfnt_off000126bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1