Malicious PDF — malware analysis report

Static analysis result for SHA-256 f146353270841404…

MALICIOUS

PDF

74.8 KB Created: 2021-09-22 09:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01ab62a7e7fc061e09806e30cec3b54e SHA-1: 58aae2d6bdb7fb5dc9fcb4072c345bcc4a97dd58 SHA-256: f146353270841404aa5a66c16457e1d130e20a72b5463edd3ccdf2a92d4e66d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, with many URLs pointing to compromised CMS uploads, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421c510d715---431270923.pdf In PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/vavejativosibigajemizi.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/oe7okvf7v2kiskrjv5cd9fqufa/deropazedovo.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/67316686389.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/1706879ccb55bb8802cbd9c993bc2cd7/22277028949.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/limivef.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/mufufumor.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/15568137592.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/66758061408.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/najibajorotarupi.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/tipibav.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/21933749873.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/sanojon.pdfIn PDF document text
    • http://rsentco.com/upload/file/6611169254.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7b7f5d589921783ee744c41d5ee1aa9f/lejabupusuzuxa.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/xojesinorogunozanatixel.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/20933084854.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc8e7d096---rawitukafe.pdfIn PDF document text
    • http://jn-zhsc.com/upload/21684284973.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/10572854447.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/97257965851.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/vubegokotunapuluwite.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/27758574889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=angle+properties+of+kitePDF 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_off0000c279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC279 16800 bytes
SHA-256: f2186e4671f2b59b22327e5aec9ede851b02c45d911d18babcb93ef921fea086
font_01_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 10444 bytes
SHA-256: 1f48e6de32a20ad19f56b1bac64c3be7f0dfa7dc8e06cff0e99d70f423b21e26
font_02_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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