Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27d1dde18a69c65…

MALICIOUS

PDF

95.7 KB Created: 2021-07-04 09:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bb27881b0888db87d4abd481ae5f08da SHA-1: 9fbcac6091356a86a594a474be73ed57585d8a12 SHA-256: a27d1dde18a69c6583e48e9c920f493ae15de301a1671600cf26b82fb232a75c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to websites hosted on compromised Content Management System (CMS) upload storage, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.contectrade.hu/fckfiles/file/33679621459.pdf In PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/e77cc6e7741e9de83c311b9bb8800b8b/88581853638.pdfIn PDF document text
    • http://alltechsro.cz/files/tusevijine.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/lokumajevubiduji.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7fa56bf996bd37ee83ce777dc7c1f95a/divememanabisu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/345f8b8bde84b6fcc1ad34af6f300a8b/36927084054.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/pewiji.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863c1e1224c---vukazogadokuxoxugaf.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/rinobiwabota.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///53737679028.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/jogaponebejotili.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091eecad1f9b---26249364151.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e1b97b76b---78598747342.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb2cb1bec---6603887726.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a1616148---64562934742.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/sezugunawizukirunosuvu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088f3bc430d3---66265016970.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/87427193966.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/43007048042.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e8fcb9aa---50745867430.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad08aedb779---midiwodenuzuremunuwowosid.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/nugikadafagixutotixuxeta.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hu5anfh44pl6oigbm77o1bd0f3/44515963955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=personality+and+consumer+behaviour+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12740 19188 bytes
SHA-256: b749e2882a07c372b6ca97351a1a6381896da20204fcc3a88ed845f23a130236
font_02_sfnt_off00015753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15753 11308 bytes
SHA-256: 17709c377cda2bbf276a7db785f28098fa4009035c8216273f2d93c6b79b3c82