Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d138c4291c71de3…

MALICIOUS

PDF

95.6 KB Created: 2021-09-02 19:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 49f213c704f927f03c0a8651ca082e3b SHA-1: e62a4a4cb7a46974880326ea6a0320f92746b119 SHA-256: 4d138c4291c71de397bde66fc255a392a9a43c08f072871fd266e72299f8aeb7
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. The presence of multiple link farm heuristics and numerous unknown reputation URLs indicates a phishing or redirection attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/o88orqbnobkmeidiebj5mi59o9/47433823968.pdf In PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/dc2113c3c7bb6064930a1af5f05d9522/sinix.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/tebawegufojivuzo.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ee923248f89d5aee2d0284fc11d2a69a/65230619975.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920f918293a---roporijixefivu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a800ee0123e---93580756585.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/muzifujupimawatufemofuto.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/wolidufamixobalodiz.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/553b6ad3399bbe3115ce5a87a42a58c9/27074438150.pdfIn PDF document text
    • https://mytopics.it/uploads/file/xugizulijuloxisitozuve.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/93028024798.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/da8c20549899284e1ea4190d8f86ee29/73477671551.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/lawidatunovanokakabetetak.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/14521119159.pdfIn PDF document text
    • http://stepsforstarlight.ca/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/98572851383.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3d935b2c0c5850d2f62fc15d775564ee/saguvenanetowedevarob.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/1a623de2c4f55c634be6224e3bafb85b/bolitexonedimedezuf.pdfIn PDF document text
    • http://www.heksan.com.pl/file/zazetemositiwulilirokatog.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/52b814041de02537b29bc6b9c6ed5f9e/vovimawo.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/j9tsert59b526mb345qmrv9u4g/55029720674.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/fuzeragal.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/98511193213.pdfIn PDF document text
    • https://energooptima.hu/upload/File/86041733104.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/a2425f88c4e7c9632b7ce7ecaf583b13/57231713014.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/47414778421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=marantz+nr1601+user+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 18204 bytes
SHA-256: 6f81535d6abf848f1ebad5f5684653c968b8b280a62cfb918da863490f81b0ca
font_01_sfnt_off00012537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12537 10552 bytes
SHA-256: 5256945b14fd78bdfe258cff5eae710e38644ad4f63aa69c7574c3e4d97a1186
font_02_sfnt_off00013d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D71 17692 bytes
SHA-256: c6372aa2715c79e85e2b027ecd26b5ea7c272eb8a2acd0bd72d051f2f3f03708
font_03_sfnt_off00015869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15869 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1