Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e0bb6acc5b8e84…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 12:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16003b8454be877a5efeae3ad3e14fd0 SHA-1: 76e87f60e0ec9315bbcc5e71603a3cb5e001ff72 SHA-256: c8e0bb6acc5b8e84387a98e3112d461fc38c4999c842daf57d3546d6207bc552
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://niezapominajkowo.eu/userfiles/file/28141376765.pdf In PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/wojurikakuboj.pdfIn PDF document text
    • http://moretonassets.net/userfiles/tisikopex.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/2234930742.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210906_FA70742D322DC358.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131c6a808179---78608305412.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a06360e285---93735323033.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d7b2d34ec93c036d5468e14a52835724/kivobekijegovibubanol.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/vozutanu.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/32441272032.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/35458034672.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/75331364009.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/lk0ho1dflkbjt66vtpl4alqbj1/20451264003.pdfIn PDF document text
    • http://xtra360.net/campannas/file/74519270791.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/56rqjkvst5bbqsom4it4q194p4/jikifobaten.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/73724488845.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/34267603269.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f09e1062b---66390616785.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vomosegik.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/16332662259.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/lapisizimebemoku.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/puniw.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/59209500766.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/kelota.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/18729703633.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/14579459346.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/55479791236.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021910102277860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=unblocked+games+hacked+gamesPDF 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_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 10768 bytes
SHA-256: d41b65088e571149232c247dd0bafc1a2ba3d2c3a317906093dccbfef2a47ea7
font_01_sfnt_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 17504 bytes
SHA-256: c5a1fe7100ee9a4c6b3b6dbe85f544daecd760958ce324cb978bf3d931862a33
font_02_sfnt_off000125e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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