Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98c63aae5c091a4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 00:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aaa7206a76a781c2b5f7583debd852b4 SHA-1: 5efb62b10025bead9aea8dff329331de3e020510 SHA-256: c98c63aae5c091a4c08ff29a2eda74c1c2daeb689b38eae5b3d9a6137946666e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://cmtdental.com/upload/ckimg/files/vanidufuju.pdf In PDF document text
    • https://literie-depot.fr/UserFiles/file/3499029125.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/13h7llisdlku5ddnhotraatq9v/ruwagejatizugopo.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/45nvmti17m219q3i1006edc2c5/891524748.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/dewaretafizakegukunux.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210731005741.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/xigusopu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ft1mrk1d4nq9gnujpk1q457gsk/42758048787.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/36074476118.pdfIn PDF document text
    • https://computerzone.pk/file/begufar.pdfIn PDF document text
    • https://subarini.ro/mm/file/perufokalab.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/kiriwivow.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/5204060896.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/46257428846.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/61043087987.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608604f450c38---25914905890.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/56ec39191f80cc4c501495c4480d35b3/fodisufelotogerugir.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/nufolugobadurif.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c9c2a4022---pajaderoxunawitorazegowo.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d3b27c0db0c41c511fe05f58690d1b2c/24210216903.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b50dfa8d95b---49034454943.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128d3eb01528---xadupep.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/85ac52d9499161388a2240b36739e169/21150382708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=econometrics+exam+questions+and+answers+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_off0000d20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20F 11152 bytes
SHA-256: 5a23ebef4c7e26b72cb55dc5c97671521a87c27ed7de88a3b9cc4ef0ed5894f8
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 17324 bytes
SHA-256: 2a6a6d23c329eb9aa01380a18db9e581b9b6e010a8133ef23590fd17c8426d6b
font_02_sfnt_off000118d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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