Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c14ca4777d3d746…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 13:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: acf5216f20b8cfdbcb908475968f6b33 SHA-1: bcd9d683cdbef589a7fae7d50f80ca6b59d26911 SHA-256: 4c14ca4777d3d746cb4491e59bcd268e6aadff4bdafcb545c5632f98430e85d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, but the presence of external URI heuristics and link farm indicators strongly implies a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=money+master+the+game+pdf+free PDF link annotation
    • http://ppogrimall.com/upload/editor_image/file/werifevowex.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/efe0e563505061ca66f92a91f91cea9b/94852018202.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/26491255117.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/jamimapiga.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210924_124803.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/tujerisumuto.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/76525138191.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/44270609882.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe9531821f---44421876308.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/wewuzutigivijiri.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8120e39a8e6d9568891aa511c9510946/64675022852.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/65711010774.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/videxinerap.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/vozatevaw.pdfIn PDF document text
    • http://vbond.hk/editor_upload/file/68555685065.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16151c4f40e632---32749115347.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/jazubexipav.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/xoxudafevorugasol.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/73de227ed59ca95d3dbda0efd02695a9/bezuzovamogofubuvumaxe.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/1598143549.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/78857290073.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/13a6422f73cd67a726c943bf19085546/muvogawokogo.pdfIn PDF document text
    • http://miminku4.com/contents/files/56709338898.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/94835694394.pdfIn PDF document text
    • 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_off0000b391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB391 17296 bytes
SHA-256: 1c5db3bba8bb821bf83ec4e01232bbcb2b1d9be448871412f0b9fda3d6dd1056
font_01_sfnt_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF836 10912 bytes
SHA-256: cfe134bc69c4af5e8b5865df66028c3da56a56f9bc9e370a44eaf144cc027cef

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