Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef24d4d4201433c2…

MALICIOUS

PDF

84.2 KB Created: 2021-07-28 02:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 124033668affc8bdcf5ffd2fdfa75314 SHA-1: 55df8fb311d5d9630ddac141efc1ca914be60aa7 SHA-256: ef24d4d4201433c2ede25f944e0f8b935350df0150ac1dd4a7da6438df61d084
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krevue.cz/UserFiles/File/6987927591.pdf
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/bozavilesar.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a00ed7cfb5a---kebisevop.pdf
    • http://ohappy.org/userData/board/file/55006342162.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hfil9e1rqt1isf9camfkbco3f7/11275116287.pdf
    • https://absoluteanytime.com/media_file/files/files/felitorodamigadoponog.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/46842409021.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/64lnc8ib66rkn88fscqgntlfe0/maluze.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b6a2c826b311e3c0f632161db3cca9d3/taxirovimagadodad.pdf
    • http://ecogestval.com/userfiles/file/fidosaxumelavun.pdf
    • https://groupunsur3.com/contents//files/lujolipirabegam.pdf
    • http://christopherdallo.com/file/73797272281.pdf
    • https://pasarangroup1.com/contents//files/gofezetedasejedusubijusis.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/eb56008ad664dd179f6c4e00c12f2b09/23344659447.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/cb036abac6766acab6a4f710e5b13faa/45685533122.pdf
    • http://zhengfutz.com/v15/Upload/file/2021712042172889.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/ninoguzefajofemazofapukiw.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c991b0bc43b---54144680135.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/65938403602.pdf
    • https://kiameds.com/images/upload/files/radezusidagazisejera.pdf
    • https://pingthye.com/userfiles/files/jejilipopemuritisulab.pdf
    • http://www.mostex.sk/files/articles/file/15374774241.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e24b11b4be1e008f2feec8e582d222ed/bexoxivizexadaxotisowepos.pdf
    • http://medicamarsala.it/userfiles/files/wawukofipagibug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ubio+labs+charger+manual
    • 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_off0000e1a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 16792 bytes
font_01_sfnt_off0000f9b2.bin
1cee784b761796c47670297b2fa107f4c1249cc237bdb0f1fc748b9763a1c0d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 17796 bytes
font_02_sfnt_off000128af.bin
964ee4e4d534593a22f63ea4cf070daa6c9760e04c4e77fa5d74f21abb893fc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x128AF 10824 bytes