Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a92f980e9ec40d0…

MALICIOUS

PDF

96.0 KB Created: 2021-08-07 10:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ebfb23a707edb157a3f6a1d9cef4b98 SHA-1: 964c5d63dbaa7e9d7d39b7eaaf64cc9e4a33e051 SHA-256: 3a92f980e9ec40d02c3008c6357fc3a66e84e46c01ac02a45fe0c2d278c8ebf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous external links, many pointing to compromised CMS upload directories, suggests a phishing or redirection attempt to lead users to malicious sites. No scripts were extracted, but the overall structure points to a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/88a72c262ed9d177c7083f65fdbf7f34/33844209897.pdf In PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/2f7e338a4ead2688226a1bf4dffcf1be/59053295232.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/01c4b88115a6b3ead3af95dca9caec3b/14340752873.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087812fde428---xajujivi.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/14768161545.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/54568189484.pdfIn PDF document text
    • http://argekaucuk.com/nbg/upload/files/lokep.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/lkmu8daa84qb0icctrtvkvc8cv/magunura.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/gezavolonib.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e795d118e---92005239400.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/xukijulipopitafawa.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a28ba86d6---tevusaxu.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/a40dfb11447323552d21c5dde8a990ac/78208416715.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ee013d2e---gumowazawurogejex.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/17804635042.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/402d5bd47fc815d495a8f41dcc586b16/xukovopalabofagowo.pdfIn PDF document text
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/kawebolabawawiwijopiwibep.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/zetiriruvulaxavitidokitaj.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/28072348122.pdfIn PDF document text
    • http://gojjang.com/uploads/files/7662001884.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee7b142bf9---kojovagejikemufola.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/07547aeba2446c8f3e1831a496d955ac/11152338064.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/40476354034.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d056899967---47418147068.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/wojejixajina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+is+afro+asian+literature+brainlyPDF 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_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF1 10656 bytes
SHA-256: c5de7d4114cd3b8ca73654bff91425aa1a7060b0316dd5c9503aa42c239d29d3
font_02_sfnt_off00014455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14455 17624 bytes
SHA-256: 8b814f100932c7c5a5d0d061d8ce4a86e25adc5c8694ccced44a0e385907b8cd