Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc034c013c5d7eb…

MALICIOUS

PDF

81.0 KB Created: 2021-08-29 02:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c085ecec8455c41e846dbcc3b0af8fd0 SHA-1: fc5bb4a3f6600d39bf7f30d7cb53e66f6c829cce SHA-256: 9cc034c013c5d7ebc6c7121960ed4fb340943c920af539ea0049416991c0aab2
164 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or scam campaign. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://alhouti.com/userfiles/file/25913563819.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/6vboqdcr6tlfep0gkkkavtd6oa/93890004595.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/tuloxopanebat.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/35115594155.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae244e58a4---ginigoxovirotaz.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ee6c160c0---25075306517.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/82758287314.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/83818560934.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/dalelikoj.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/52013073510.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/7906866661.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/16620364020.pdfIn PDF document text
    • http://policylic.com/uploads/files/1275829266.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/17713377153.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/355780f14f9de6b70668927f39258ed6/38792804939.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/41590304087.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112c54e87ba2---foraseribuxasak.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/vomopamafudupos.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/baroboxo.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/bupapotedovibolal.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/32018690513.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/25809444704.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/08/14/45333021431.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/8v6f3ligjs4b0e1sir29gv8p02/85272166054.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/mekesisumugexadijubiwusov.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c9f8c9a846ecfdab7124352398a1edd3/19421146792.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f532c2413---82031838630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=10th+class+sst+mbd+guidePDF 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_off0000d3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C7 19092 bytes
SHA-256: 4a3f70fcd19aefe35567c963abf2c784dce6e0e143a2e86b153df5c6d5744de1
font_01_sfnt_off000104e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 10808 bytes
SHA-256: ffbc77b298d3803d2c77bc12c6016646b7a8e830dfb9c4cf4ca0278e8679dd3c