Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fb69ecc343374e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-23 17:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb8377bf85dbb29b45266877c64074ff SHA-1: ea38bbafa7ec84a650fe9bd6c5bc338ef28ee51a SHA-256: d6fb69ecc343374ec8e41c5dd2c53f7e10575f780193016d70de6af46dacbe5b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS platforms, suggesting a link farm designed for SEO poisoning or phishing. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=frp+unlock+software PDF link annotation
    • http://rucodelniza.ru/userfiles/file/xepifoziloxemarekorodo.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/lumusimuk.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/niget.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/80039575416.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/junejen.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/moguro.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/lawodopuzanidagagunuja.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d260d44ee---fapudavakof.pdfIn PDF document text
    • https://insp.biz/img/file/xogafikiwusepomomororitu.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/r3lua2o47o0qpf030h9l034pmk/25891944849.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/79680142722.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/60909050516.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/75484498093.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/49264307234.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614acc81c6e01---52985037888.pdfIn PDF document text
    • http://st03.it/userfiles/files/28724208470.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/25335224223.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/xaxusepovizopaf.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/79072654551.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/71566078256.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/lopukosijemiruj.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/26010654444.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/88976923575.pdfIn PDF document text
    • 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_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 10636 bytes
SHA-256: 728bcc070c25faf0a6b934192b3c47b5c1577289ba5dba5f1bf36ce44e3b4364
font_01_sfnt_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 18184 bytes
SHA-256: 032893a0165ffad5f77cb748f26433fc8739f2d734cb882bf70b1e2abe83a02b
font_02_sfnt_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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