Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ae946b4ad1d9ad7…

MALICIOUS

PDF

87.4 KB Created: 2021-07-21 10:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ba9ef535f7c6a1ec2ebeeb333952dc17 SHA-1: 69980488335ccbcc2f6082a1602185f4919aba0e SHA-256: 1ae946b4ad1d9ad7e2759220431dfc77fedd9c2e441befb5dc006c082f5a107d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and other domains, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent of hosting numerous links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://albawadiroad.com/userfiles/files/96564135512.pdf In PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210526032557.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/53759656476.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071e42124c6c---tepirubawejojawilile.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec55502752---47513641828.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/00h5eea89ju8e1b46s4fit5nl4/75851242488.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c75861a2c76---sepaxakosi.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7183e2eed---xobasofojijujija.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/12758798154.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/20863019012.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/18087921403.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/guwuf.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/22372915770.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab86737e64b---24425222406.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/bedf5dcfad59c95fb96edf59ab47aa2a/38324533874.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/fobilaxivuj.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/86375716044.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021072020451973499.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7e3296b7---kiveji.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wapelisifod.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/phju00t1nnveurtolten6k4jj7/gipanetimevabero.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/50766074294.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/94848034030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=hypo+glycemic+indexPDF 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_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A10 10536 bytes
SHA-256: 124581c4dd0f5de8914b5d5e5ec10d224b6db492cea477b32b565ad9b0180dbf
font_02_sfnt_off000121ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BA 17312 bytes
SHA-256: 628227cc6ac9564b5975900792f432d5e0d0868dacb46bf13e83aebe798dc3ee