Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c361bccd8cbcd1…

MALICIOUS

PDF

84.7 KB Created: 2021-09-07 15:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ff8d0c2ed5365735edaee483e8f07bc SHA-1: 9b326311072430176db2126acff828f1ef4dd103 SHA-256: a4c361bccd8cbcd1bcc2b6846cc5a4ef4c9b8968a6d9a97102c11fce1a4401c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF's primary purpose is to host a large number of links, potentially for SEO manipulation or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/aq604rgafdvcv1qs360j6m493s/87878675845.pdf In PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074433998a6c---84578584112.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/sofemogu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f9e59995a---4538522254.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/71897909640.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/gikom.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d14e052b4b---63491034676.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec41d97b76c---89303532891.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/76533086723.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a48ec838e---welugolapodinexuji.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/34922775705.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/28880756905.pdfIn PDF document text
    • http://stadiumhighschoolclassof1965.com/clients/0/00/0080f9a3d0f10e930bcfc39f0a940e94/File/kobifatapavarutuxavumuxek.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a5d560090---xibowerusewatadaxejof.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/ragpbugf04f5vved7ufhfobjs0/rikimez.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/88201294853.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/vopojixipejeverifejo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a919d7bbe3---vigiriwewugikarizabuba.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/gatuvofuvukisigisudivun.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/mopadoxepu.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/vejazobobuwobulaza.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/if2ku0jdp56jhjlu86r5d9edd3/putazolovazepodunagakov.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/dutiwewasez.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/16170186387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=adding+fractions+worksheets+with+unlike+denominatorsPDF 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_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 11180 bytes
SHA-256: e2c0f3ecb0222253880e7973035328af43d7653d3ebdb88c35c77a7939d692c5
font_02_sfnt_off000116ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AD 17724 bytes
SHA-256: a3149b862c6f17925d5b5c6bebfbde433996aa176edb3d34db752b1e9488788d

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