Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfca3ed978b0cd2d…

MALICIOUS

PDF

94.9 KB Created: 2021-08-17 13:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: faa3310c93e8bf0c404330b9d9431a50 SHA-1: bd2eaaecdaba024f05e17a0eb579f61672a9b857 SHA-256: bfca3ed978b0cd2df153c575ecc5ca2850afa4ea51e6cea4ab895e8d5ed0ff5c
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 0.9971

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://magerp.org/upload/files/jijevuvunopu.pdf In PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083988e0c9c1---fakunopupi.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/wavexofula.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/36370173853.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbdf290407---28624271831.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/gunitomaralulanarezol.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/34278959125.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/23008173b0901cad0a77a7a20c42ac2f/77423100117.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/50485712632.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/92bd0a5b4068b33eae29b6d4df775045/55638178031.pdfIn PDF document text
    • https://svltv.in/userfiles/files/29953760919.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6e1e04a6e---talufomebupavamutoxuna.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/2e6f544113d85083eec1378649dc9228/balusugol.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2a6227744e865007baac37784bed2bd0/2138407770.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/33019059414.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/tutowamezukutofoti.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5af8545f7---naramidisitulaxavijuguw.pdfIn PDF document text
    • http://envigest.cz/upload/file/naluzivomafirogu.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/90866969412.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/75624694575.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b906f970---42651813046.pdfIn PDF document text
    • http://health-bridge.in/upload/file/91092782588.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/90855011a99df358e5b3c0597ead20b6/tetuved.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+code+for+infinite+cookies+in+cookie+clickerPDF 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_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12133 19132 bytes
SHA-256: 306696f6dc8b17c813953e947acfe7a66d4378bd6d8316bfb3609f46a6f4b2aa
font_02_sfnt_off00015330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15330 10656 bytes
SHA-256: 367ea62fbc6d8fe023d50e7d03eb0b0ec772dbe9f3f20c59d445b46fc921a11c