Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6983bf57f1ddc9…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 17:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 295da582358bbcbf13eabfcd11e3abc5 SHA-1: d403a191b7c2ed4c3065cdda3146a966e7261d8c SHA-256: 4b6983bf57f1ddc9d20c35f573d8fb8a1993067975fa1caea92fb31a6023e542
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821664e9256---99126301073.pdf In PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/fe6ce33aaedf2b9a5913d028902412cc/71541045654.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bdba7165d---73043308744.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/4430341850.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/86526234185.pdfIn PDF document text
    • http://jsdarvin.com/files/20608578548.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/1bee71695de46325433fbad994d6f9da/72837372109.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089192f8e62f---mirirasitu.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a75649254---64736946070.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf10958fe---jaboma.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/tmc2j2n4t3al83fkol5fbi7nfi/30285351676.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/64000931865.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd37c924787---lebubapubuw.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/5396251838.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2161b1ab08---56444675.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/gadodagimewadel.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2dbed7381247dab169e71c3dce29ba16/59061171085.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d23bc5406230b550551d754a988417b/datasisive.pdfIn PDF document text
    • https://ntc-container.com/upload/files/31651246534.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609db0dfdfea1---pumeridus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hebrew+to+english+bible+pdfPDF 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_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 17716 bytes
SHA-256: 05e650c8a0b0e4da274bb0346d4859231515d1294862c072225af94ae7007911
font_01_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC2 10832 bytes
SHA-256: d8078f7865479038a9c9a4f008d227e3c23943e62b4436708e0e2035ae5ea214

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