Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5393ea9f36b09db…

MALICIOUS

PDF

78.5 KB Created: 2021-09-11 04:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: feef5de8a6a14a4e5c55ffede8ce97c3 SHA-1: 32d56834cdea13f633a907522d913f73c9bf7535 SHA-256: d5393ea9f36b09db544d4bf031a4bb263459b98ed8be808516556cdb51ef8853
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, likely serving as a lure for users to download further payloads. The presence of multiple external URIs and the nature of the hosting suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf3e15b33b---daxavo.pdf In PDF document text
    • http://okfilm.kr/userData/board/file/futefigobobigan.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/dagiwoserarajoxafegupubox.pdfIn PDF document text
    • http://vecsecity.info/editor_up/40582434238.pdfIn PDF document text
    • http://d-innovation.com/upload/files/35957261906.pdfIn PDF document text
    • https://cubic.is/userfiles/file/najirizekuvoxofitedesosow.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161363da2a59e0---xolitagaraxezalejamedemed.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902090050211808.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139a6b61e5---12540307940.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/zedomafofovafipabexika.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109060426181537.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/19692062643.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/mijuxamugujajewul.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/10265878926.pdfIn PDF document text
    • https://betsin.org/userfiles/files/nejasufewotigejevazed.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b910cf902---ganurivomoragebujanoz.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/sororeresileberafizezivu.pdfIn PDF document text
    • http://state-lithium.com/upload/files/nuvinawaforiximafu.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/lofajokotewama.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/paval.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/fipumov.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/30255963396.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/94007562922.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613647b0ad1e6---bodumorafoxivuregegikun.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/24642758887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fall+guys+mobile+download+free+apkPDF 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_off0000cf62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 11252 bytes
SHA-256: 7b8dd963cc81d14a370deaec2dc2f51d508c7e0b1e05496c262f43aeedac1bec
font_02_sfnt_off00010175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 16628 bytes
SHA-256: 8320eadc56c2bc42b3f4b7457eefc0f91353b112cd12f2468d54136ffd789359