Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd854f603dcae2cd…

MALICIOUS

PDF

130.4 KB Created: 2021-06-26 11:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d9d0a6085c20bf947195617d2df7511 SHA-1: 44be45639849d759d5701f8bad7dc9bcefa8e5f8 SHA-256: dd854f603dcae2cd7ed02cfaae59c4f764e2c7d9746bfaf219c05e89e0a7966c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9845

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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b3596f4c5b74a7ea4f7e6e49dc245eee/28198252616.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160937dd129654---lizunetefokokojejexolomid.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/16162705358.pdf
    • http://jevades.com/aircraft/fckimages/file/51116928607.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160720edfa53ca---limufolaxufasesazujozezu.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zamukamiferifotojudasej.pdf
    • http://focostrade.com/files/20210612072551.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071556f881be---52537841595.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e187de6e---lunijizodizatifogolew.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rdgoq21hldf0tiq49gam9ke48h/wavujimefukug.pdf
    • https://101doctor.com/uploads/ckfiles/files/60b2a4e8192a6.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/23516b245d6b99e50265127e9710f2c9/44717395585.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/sdk36fhn9q8bf5496897a12j6k/4665222071.pdf
    • http://bigpictureresources.com/userfilesbigpicture/file/sabivumanesuxumusote.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb6bc2502d---99823222012.pdf
    • http://apvn.info/userfiles/file/vigigoluperobuzinezamak.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/a49ced94aaffd4fc760750e6dec92b37/52907096580.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16077124d469c3---97435046460.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d641a380---41519279972.pdf
    • http://omg.su/upload/File/nagup.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c54d0deb---18755141549.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2e4e7e6ff5cbaed54117e1395c180110/gegajofi.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2323a2319---sazor.pdf
    • http://ainut.fi/userfiles/file/78502389896.pdf
    • http://sbstroy53.ru/img/files/jisanemujatexo.pdf
    • https://papiratisk.cz/soubory/noloxajururik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=wilde+the+importance+of+being+earnest
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019b52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19B52 16792 bytes
font_01_sfnt_off0001b364.bin
b83a65cf03b77d91258a7439287fc6f15b00891658a039f0f45eff78946f0d1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B364 18232 bytes
font_02_sfnt_off0001e252.bin
b0d61ff87c5818801c6ebf5e854fe1f1c797db536f332c91423de66d69803aef
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E252 11200 bytes