Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9d84d3909e8531…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 09:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5244f0104b2dac88d821eb39ab4eedeb SHA-1: 2762d53e9a54c55629cb170b57adecaaa78173b8 SHA-256: 9b9d84d3909e8531ee9abd78eb317e1d6f4c22686620b8770a20a69bf0f884ed
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating malicious intent, including a link farm on compromised CMS uploads and a lure for a password-protected archive. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The embedded URLs likely lead to further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=tekken+5+apk+download+for+pc PDF link annotation
    • http://auswallendorf.de/userfiles/file/nupeluvegelavav.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/nujuwus.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/55984238815.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/63939019634.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/felebewubolu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/70575956dfc273d618e3baa810445e14/98474112673.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/75868444659.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/36477508275.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/vulewaralesoperopofu.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/19303344749.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/zugokezapegogewajikisuma.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/jiwifawuforibe.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/22797819013.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/77883232181.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/zevimokoxiwakomogase.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/lumalutikagedanuve.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210912112933803.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109050242137258.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/punepisa.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210907062706.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/96625635252.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2ee6ed72---bewisumizonafarudijok.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/20863812944.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/rixukepufirapuzikurebe.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/kusafevanudevowizav.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_off0000e501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 10532 bytes
SHA-256: 70c1ed051aaf95c9e1643debebb3b8d8f0f9f93a645e6e7f253151ab14cc51e0
font_02_sfnt_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 17284 bytes
SHA-256: 6e7cb426d2f0b763a19ad9dcc8f63cbd05b43a24469dd05bb9aac649ead9aa86

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