Malicious PDF — malware analysis report

Static analysis result for SHA-256 b004e4138b98e909…

MALICIOUS

PDF

89.3 KB Created: 2021-08-16 18:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68ba23f26ea5b181e7421f3389752ac4 SHA-1: 0d0f9c4592f4e38acc874aa1e4bef3c2f9a87f2c SHA-256: b004e4138b98e9094456646ffc18d7995ad7fb4ec4d9f77c0e48a35f300c5008
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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 http://www.lebedosapartotel.com/data/yukle/files/zatazabukasufukifasi.pdf In PDF document text
    • http://kiuanai.com/userfiles/file/bunepipejawedizadugezo.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/99989136137.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fef4c426ee8b9f273553b4f8dcd2615c/dupiragaxiboturop.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/h0l0m0gf19qs1aeslsjgip3ste/xogugulolevisiveba.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/fepusinak.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/88611478188.pdfIn PDF document text
    • http://adveotec.com/img/file/meruda.pdfIn PDF document text
    • http://www.centralperdana.com/file/30084161682.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5dc7ceff5b8801b001e2032c5fc6af2b/59595131468.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/gofar.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/retimuruxofudi.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b7d9d5750---lofororunitavik.pdfIn PDF document text
    • https://12shio2.com/contents//files/tiviloxeta.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/291cb41df4697728c1173cea06d3bbe2/kojoz.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afec35ebb7f---vapumalurutukuzajipudom.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/u11unco8ra2eaj8tjas8hls2kb/4128718927.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/musuta.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb61f9b25bc---numaxifed.pdfIn PDF document text
    • http://manleyboone.com/clients/3/3d/3dd19be848c73b0ce3a0430f7fd535f3/File/zakosasufaxikenuxinipar.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b783de324bb---morarubigunekipozobese.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/xaxod.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/walitubevasanigen.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/21772807165.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608db188e8e12---sujakoreliterubozinobudoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sunbuck+amplifier+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 17148 bytes
SHA-256: 48ccd647635f9d15b66766c2c0e8891604fb67804e27619e067335de8c7d3ed2
font_02_sfnt_off0001270e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270E 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00013c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C54 10664 bytes
SHA-256: f583bbc3188abf97a16b3b11d0f32dd0cce85db1b6f0bd9c3617fe96287797a1

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