Malicious PDF — malware analysis report

Static analysis result for SHA-256 765b5755acfd0688…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 15:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e19247c37995a20d5f5e85746fb6f5c SHA-1: 18ae066c8849800e39e8a069ae0ac2ca7c4369e8 SHA-256: 765b5755acfd068815380c64c95f51bae3608d53661277050fec19ea0acdd47a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS upload storage and disposable domains. This structure is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious sites. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://naturalmis.com/userfiles/file/45169007745.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/cslpi8s15p1sji0v1bc1h332p6/motuzofadasipipa.pdfIn PDF document text
    • http://stattus.com/assets/file/jeditud.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa26422eb5---javagid.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/depinizuferitisa.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d565de252e---rekavugubikijetumu.pdfIn PDF document text
    • http://araonline.hu/uploads/file/12436663108.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/o7gvet7t05p4uigaif1j2ogcjm/31728960883.pdfIn PDF document text
    • http://lactopad.com/uploads/files/68730040807.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/39600075149.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/molexexawavebakigubup.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/86466171556.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/56728903877.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/kodujutamiradetobibi.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/69119476882.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1286494c3---migomuja.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/51496734266.pdfIn PDF document text
    • http://licausi.it/userfiles/files/10416012539.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/09226da9cc781c1bdef1d1328917b11f/77637089751.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/d3a45bc3db1e2d6c376b206bebaf7ac5/7569355872.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af99675afb6---32167042285.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/ronuvadonigokipove.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/2194900650.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0822a3633c0dd4579bf617a701fdbaa8/dazezakibibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+are+baby+cucumbers+calledPDF 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_off0000e015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 10668 bytes
SHA-256: 2fd9ebc6b6267157337a32b08e8397cef5c50927717c980ee3368ba870900573
font_01_sfnt_off0000f8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 16956 bytes
SHA-256: 479cdd14983a5a1fd9d076348e87a6859620653f75cf7f7266372284512aa48f