Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b63576eccbea825…

MALICIOUS

PDF

98.3 KB Created: 2021-08-02 07:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 183b4db7654e09e85d134bf620cb5709 SHA-1: cdf1fa341669d73305fce565a73639907347b930 SHA-256: 8b63576eccbea825ebe35379df27f677cdf082533c22fa700adb295d862967cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://lezeckastenakosice.sk/upload/files/38930162443.pdf
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/nolijerifulibi.pdf
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/45465992783.pdf
    • http://poorclarescork.ie/images/27120675473.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92f5020071---devarat.pdf
    • http://gps-tw.com/CKEdit/upload/files/57096782704.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16070a56692300---rowagakogurofemamodi.pdf
    • https://oteaexpert.fr/cite_imgs/file/ralolipekolekevit.pdf
    • http://animationcoach.com/userfiles/file/viwixunexazakexoko.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5bc8a253f347d51d731ac2575478a845/77616922549.pdf
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/44801396138.pdf
    • http://cesurmakina.com/userfiles/file/37654410643.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e386e409a261378baf5b3b3f08a8c09f/70363193458.pdf
    • http://dieta-plus.pl/userfiles/file/lavibezerek.pdf
    • https://hansenlight.com/UploadFile/files/jafepawuroxefavomex.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070be395eac5---65334350162.pdf
    • http://tgtech-auto.com/userfiles/file/bazidixapezebeginizisik.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c2167ea2---kakilisiz.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae857cdb2aa---3501220517.pdf
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/retimuruxofudi.pdf
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/vojasofixenoxi.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceeb9a4964---tutevuv.pdf
    • http://cn-polylysine.com/d/files/voferoloxiwedibiwogogut.pdf
    • https://martensmgt.com/business_school/uploads/file/3806507479.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=plan+anual+de+preescolar
    • 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_off0001184b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 16792 bytes
font_01_sfnt_off00013062.bin
5d269268485d8696058281b61e4a2f75c29033578f0c48d12c6bf279a9be4ffa
pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 10420 bytes
font_02_sfnt_off00014811.bin
788962bb8c824ae96ac24507ea7c94ea9693b17cd9f909a7e4e59ce6e847db08
pdf-font-stream PDF embedded font (sfnt) at offset 0x14811 19436 bytes