Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8b1c81996f2116…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 18:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7a73f3e564b081c83d90500caa705cc SHA-1: 5133c4bedc7a39b4613f9b796878abe139d62e07 SHA-256: 9c8b1c81996f2116e71dec03213ea84c44dc6f226f20451aa9d06157c0a94316
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://philabc.ru/uplcv?utm_term=haim+ginott+congruent+communication+pdf PDF link annotation
    • http://grafiport.com/userfiles/file/sixurexiwi.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/vikirewabekujujos.pdfIn PDF document text
    • https://thechoose.it/file/6467482189.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/14500033076.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/48504365996.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610441689ffcb---siwomale.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f3c97cfa5---21923895164.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/24275098250.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/27954525444.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/98c565ea130d5df4b906ea83b777a458/menibujeniwamixoxibeko.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/55049262278.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/87949058470.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/q51riftpj6sedf571r4o3e6par/36647729027.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f9fbce62---89360023774.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c87eba66eb133bc9c77098b6e7e43041/91878779894.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/f8795fc5a76d4a20824637d1d0ba245b/5255894746.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/67691387623.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/ladafezogekifurupib.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zelegoperawakalekapiviwe.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941dfe47efa---62787174743.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/54178882811.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc483b1882---34895263364.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/53011565379.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/rinisirarotusu.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/1db73d2671d74fa9524e6423f2eb1b09/losigaduzukenolesebi.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/rewufek.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_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 17900 bytes
SHA-256: 815d6b6e946c768942815f1750b7086ba5dab945bb48988631ed554b40ed2aa6
font_01_sfnt_off00010991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 10840 bytes
SHA-256: 360dbe4fd97ff4c0518c4bb3d455ad8bd0122c57aad3db5b2121ca904d80c455
font_02_sfnt_off00012250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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