Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6b3c3d3197635b…

MALICIOUS

PDF

101.0 KB Created: 2021-06-28 18:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9b69f5f083c1db6c098c372eb6b7821 SHA-1: 7d3a584b78156b493752c2c6625e696e94421ae0 SHA-256: da6b3c3d3197635b5d3ab72100eba7c495040b242851b8c8ddd0e49a3115236f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics confirms the document's primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://louvre.lv/res/wysiwyg/file/jotevitosovasubelisute.pdf
    • http://sushinamu.com/uploads/files/fapajivevetubuvedojapeke.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4e86e44f5a225ba6bd06bcd9a34828f2/kerebudunidixirir.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0e89cd55---vakuxegilubo.pdf
    • http://ilkyoukais.com/Images/Media/files/156657189.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2583464195---doluruzo.pdf
    • http://brianhaymore.com/images/e/file/zepatemotavoretaduja.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47e0a21e4---kegukokizixesogod.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/7ef3df90d01a840c0ca4efc8009cfd87/42931039869.pdf
    • http://msamerica.net/clients/873634/File/62128404267.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160875a2925e5b---zewobitadujuvefazenufosad.pdf
    • http://yossy.biz/userfiles/file/5294825037.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dada8fb4e---vefuvewonot.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/287ec5b09ff38f16e1b8faa38ae81dab/45404795381.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160724d769fccb---33037213165.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/smrq794dpkcenv3mfsbhs82kg8/rojedegusizexolewonegekax.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/15164918189.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1955f9b3---digewewimeba.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/38e94cc8363d486ed8ad31ae632d406f/89485375102.pdf
    • https://inncredel.com/uploads/74822262896.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/25995740549.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pets+value+bgs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010eab.bin
8faf2c215c483c661be2f87c1b1631f7076fc5b321c24a8c35b8e3d3e6437d96
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAB 19364 bytes
font_01_sfnt_off0001424d.bin
75b586f21231a4504bd8518f65a798e04f1d3736e1680262625002f5996a6364
pdf-font-stream PDF embedded font (sfnt) at offset 0x1424D 16100 bytes
font_02_sfnt_off0001579e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1579E 16792 bytes
font_03_sfnt_off00016fb5.bin
c2ccc7ee2448a36fdf10b8a265b227b5bebfb85ede6d8e3afed8934c5835aeaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x16FB5 10176 bytes