Malicious PDF — malware analysis report

Static analysis result for SHA-256 73389247f96c41a4…

MALICIOUS

PDF

71.7 KB Created: 2021-09-03 00:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 772d011db8393c018b1892987165e891 SHA-1: 252532a666eb174786f00a3573f9b5456fc7a0b4 SHA-256: 73389247f96c41a42c10b7842b3d69ba7c1603f2ccc2016124db00c6699174e6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. This suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://powerfalcon.net/uppic/files/65467447708.pdf In PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/f8eceu6iobhmmof0ef8kt6dtti/kudotokuzixuxofupibetiz.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/tu8sspdcdj818ep0ii6f6irolm/zuperavatid.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/75855533408.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/cbaa5350759ad2497b12ea572a807c31/13937944852.pdfIn PDF document text
    • https://webmenuplus.com/images/file/xavimodo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e9bf4c1c1---lupinujuxifenenenenedo.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/46112052474.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/59db017a85427b656ded579867abeb40/kamabewuketikaf.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080927cb6f04---24368862687.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e14f1a1f1---23411513777.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/19075083743.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/lgjrlcnb95rf8th46c50ipbkp2/60628024348.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/8737338009.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/34044700619.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/89489972436.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d076cd5ae9---vumilulus.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/45820567254.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/gurij.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074193e27d14---65179134519.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/63472446273.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a999019e6f3---tijubup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bipartite+network+projection+and+personal+recommendation+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_off0000b7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BC 11144 bytes
SHA-256: 1fb0735c14ee8afcb9892a873b68bd39c460ec6bb3e2d02f9196902a5157f2a3
font_01_sfnt_off0000d1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CD 15452 bytes
SHA-256: 22ac6080cd2c541686a6889e7c0ed38a40c8a68871c26dbbc868d3d4e6bcd5ee
font_02_sfnt_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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