Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76ba19a8ea833e6…

MALICIOUS

PDF

84.6 KB Created: 2021-07-01 16:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44fc1ae74948e94445b61c73f3029006 SHA-1: 3d1026748f72450ce375efe6cbd0fd05215e10c3 SHA-256: d76ba19a8ea833e6c71c8056c872d27dc895bc8eccb3f67b0824a655b4c2a90c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links suggests an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6058ac174---5403673707.pdf
    • http://arunimaflavours.com/userfiles/file/34978621352.pdf
    • http://archi1919.com/smlclub-files/file/85977965758.pdf
    • http://modnyi-buket.ru/uploads/files/petixugaboleriximina.pdf
    • https://zevkotodoseme.com/upload/ckfinder/files/56983845243.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838ff20724a---30175935915.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/ad186f08619a42f1cbb837bf016f0555/wabikupelegelejezovi.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/delidanerosululizod.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/37add89adfa5d87868f60cada1937998/65511169237.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/1bee71695de46325433fbad994d6f9da/72837372109.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b66545745b335cc4333d3ae269aac2a7/foxikitelotikabu.pdf
    • http://magogaralbamoble.com/galeria/files/gidajumu.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a2fae304---27662443720.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fc2443823b3a662a45f5efb449a17073/6341971681.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085053fe6f28---xinovetefifowu.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a2872c7a1---kalemo.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/fv9o2f069sk00q2cior9munr66/39954843055.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160af4db738e46---giwekalubumife.pdf
    • http://www.derbysignandgraphics.com/uploads/file/72751487306.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3f0e6195e199ca47878a6a472cd0ab7a/saparupilatojugoguwulot.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608eae3b6ce47---3684480123.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/90222437796.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d54d67923f2c3800ac7ed9f56548758d/93037502596.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=my+soul+will+magnify+the+lord+and+my+spirit+praise+his+name
    • 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_off0000e52a.bin
f0026365844d5a9694e0509d91e16ccdb04ff340d84b3ab1ac9a5e18432a26d8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 11236 bytes
font_01_sfnt_off0000ff25.bin
8fc494b80e8628c6b248ffbb2e51f66c045408381ee278cf7edee28ce0568e8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 16720 bytes
font_02_sfnt_off00012a56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A56 16792 bytes