Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf1f1275aaf5ea9…

MALICIOUS

PDF

86.9 KB Created: 2021-09-08 07:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7f9e3bccf6474d25602cc20194149184 SHA-1: 85223c43e9a016baee42317a0bd46aae19260217 SHA-256: fcf1f1275aaf5ea9868742b58ce1556b1af61254cd505e555b993d1a6bdca628
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm designed to redirect users. The presence of these links suggests the primary goal is to direct users to phishing or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=horror+story+book+in+bengali+pdf PDF link annotation
    • https://salwangurugram.com/files/45777807239.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffe00d51fd---21534154489.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c916f8d79fe---dodetezafixilezulasiju.pdfIn PDF document text
    • https://digireg.gr/upload/31598204046.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/nesubapuwoxozexenovugore.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/4572651123.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/modedulidisa.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611df66ba9d32---medesoruronalotazek.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/49465275153.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/19407085073.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c400de7ea0---20102240922.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/voa0ji22eph7mhpiiotmbov470/sikamogugaxibukekexude.pdfIn PDF document text
    • http://citra.cl/userfiles/file/madukugup.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/rovomadorajigodegidim.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/b5njk7fd317rlpeh7m9qcrd63s/kelejusi.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72a52f0329---35567532952.pdfIn PDF document text
    • https://mszukam.pl/dat//file/xevipovulibatuka.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/97251318274.pdfIn PDF document text
    • https://semut73.com/contents//files/togale.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a22da7752d7---datajefirunanikofexigelij.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/lafivon.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/furibikipadazew.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3c160cbe4f3ce99cb809c89a0c6c11b/235485965.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_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 18116 bytes
SHA-256: dd30c7663bdffc5ea14916caaf862ed85363d80e2424d649db9d339916b56545
font_01_sfnt_off00011c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001345b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345B 11008 bytes
SHA-256: 8f45d7f61a92da9dc82fbcb745d0d25d4c88085d7d3bef2eb5ccdb8913a57846

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