Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27f8ac524537926…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 22:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 170114f72b698a6da1e5310485712943 SHA-1: b570625b80e9e651dfc76226afcb66324de4a998 SHA-256: b27f8ac524537926cd2aeb4f319fae0acef8b43eb7cab5bc28968e67e60bac1d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress upload directories. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/3j4gmlc1n8dcl3jpr7qc92948r/wogelamifitewug.pdf
    • http://pphu-joanna.pl/fckpliki/file/17419237931.pdf
    • http://emirates-offshore.com/uploads/image/file/7830766447.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16074696089f60---kovulogovenus.pdf
    • https://drsaman.com/files/852352062.pdf
    • http://obrienbuilders.com/userfiles/file/39915174655.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c123414f253---gevojobanilofiguzej.pdf
    • http://danfilenemd.com/clients/67744/File/fokad.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/13336861429.pdf
    • http://aaz.sk/editor_uploads/files/77792613151.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7b7ead92d---bodorajebimafo.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090492059b0c---98141321195.pdf
    • http://cesishotel.com/res/wysiwyg/file/28256825431.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e6ceeed4f---malalavatixibuvelawunew.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/nerudupodidumizuxuv.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/pr63ifh4quc5vfjaoku879ugh2/womidikozonakezezoxo.pdf
    • http://alexlunacoach.com/img/editor/file/19271053933.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b09115fffb0fc6c40c5609ceb27fef7c/54447888687.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vpmrp6dm3iqkm8ed0anhodrr47/bozosolalil.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160748cfaab377---webisap.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a382bc5a699158bb8a4bdd10fe78cd15/lirijatukezitid.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6072208d0---76021332761.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=disappointment+in+latin
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 16792 bytes
font_01_sfnt_off00010246.bin
69aa08919361775858ae95e9de3402861c580cfdf18514812def5bb4b152e30b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10246 10312 bytes
font_02_sfnt_off0001197f.bin
69ef70c71cf1958e7dc83e78b2e7bfa5906da80504e0aa1ceb6187a7be8e2914
pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 18844 bytes