Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a914896e0b9cea…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 11:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f1ef02b3ea3f19a31227f665908f6ddb SHA-1: 2f7723f24bc8d52ced0dac0c9782f1c93720b9c1 SHA-256: c1a914896e0b9ceafe0661fabeaff2c2250e586a15c052630036413fa9ac14d3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs that function as a link farm, directing users to external websites. Several of these URIs point to compromised WordPress sites or disposable hosting, indicating a potential distribution or phishing vector. The presence of ML and ClamAV detections further supports its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://infrive.ru/uplcv?utm_term=pokemon+silver+version+apk+download PDF link annotation
    • https://dimensioninteractive.com/WYSIWYGImage/file/95148729547.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/20566028464.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/vufiludapo.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/38833769433.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134530b97a5a---30945815408.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/duwevironuriso.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/jabinen.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021912749208800.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///92970089630.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/nelizorexavenal.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ed58e291f3e58ccdec728447ea24c2d2/44762573071.pdfIn PDF document text
    • https://protum.se/file/sasasivamemibebu.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/merafamefenudadafafelepe.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/70468291033.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/82862860965.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/judawodeforomuxep.pdfIn PDF document text
    • http://brlairport.com/images/file/gusokezesiwemepojanabiko.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/fatetabowavokoxikepi.pdfIn PDF document text
    • http://rafaelokazakov.com/file/bilomapulojujufupo.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9ba2b1888---89205724662.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/78157768456.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/95934229668.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/7808083252.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/46929792665.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/49862806101.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/mafupenilubu.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6140588100.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f43b30acc2---18940310555.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_off0000b676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8D 10700 bytes
SHA-256: ed71cfb6b8d059e634d0964617fc5eea3704c9de24effb0cc25eec0296195781
font_02_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 14820 bytes
SHA-256: 8dc62ea8abb90e272d01747a5ed77e3607ab8ac403ad1aabf992f80e71f09449