Malicious PDF — malware analysis report

Static analysis result for SHA-256 940ea24183b74e35…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 00:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7010a2cf371603abf391a036ab4fbffd SHA-1: 04fbfcd33eefaae0f10ac9a788d2001d03e421ef SHA-256: 940ea24183b74e35697884bf3f364e75caff656bdafbf48093a88e921b06421c
176 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs hosted on various domains, many of which appear to be compromised or disposable. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of hosting malicious content on potentially compromised infrastructure. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=how+to+enable+qr+code+scanning+android PDF link annotation
    • http://www.mezmat.ru/ckfinder/userfiles/files/42837291582.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/soxul.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/julaxinuxefebax.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/nasemenafuzizobamoxo.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613de4cb67bd4---rakogopolujuzelob.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/fefesowipakivitojupefu.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/77757278699.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a75a93f15f75bbe052507907bd2caa03/90561248356.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/90708558275.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/sojoto.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/30128694599.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/17149235250.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/16017109808.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/wademitujokajisazal.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/kagezaraxugafowodupitiv.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/51245554411.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161408c24a6b51---99312535142.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140188c32420.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/80197799906.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/46295809436.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/87881937421.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146aaab0687b---31603523102.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/13399924280.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/14226847316.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_off0000b1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F0 10908 bytes
SHA-256: 3b6b3f0ff7d14d1c7c7ccdce15d498ef6dbeb03ed566b108787a7c55c6adbe10
font_01_sfnt_off0000cace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACE 16960 bytes
SHA-256: 1ce97fc74e34f405bdbc0dd4db9db3c754574468520fa44a57d72f675ab2b8ab
font_02_sfnt_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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