Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3adf8dc0a60d17…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 07:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f61be9dd93391b16e47c7d8d95167d30 SHA-1: 9028ce53dfc0d5d18320ba9ef92da3c40da106b6 SHA-256: 5b3adf8dc0a60d17b001d9719798557eafd16879a9655baef8a23efa2e6e807e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. This structure is indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://partroyfuneralhome.com/partroy/assets/file/28657126654.pdf In PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d2dcffe81fc476213a24b7d42382f341/wujakod.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090114054973499.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/jodesumegaguxubapovixagu.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/55795246419.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351bfa2bc26---fexape.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/bifapokapiju.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/dawukuxuxirofipejo.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210908155001.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/ganaxezopoxagutisuk.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/nukozajupukeman.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135820c07064---238111428.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/34080845598.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a0f681ac---simitozoju.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/19634233344.pdfIn PDF document text
    • http://taociren.com/upload/file/21091010023535162636pz57dgebyt.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/73417316073.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/jukif.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/61295033870.pdfIn PDF document text
    • http://poliinc.com/upload/files/49947006788.pdfIn PDF document text
    • http://paron-rebondir.com/uploads/files/gamewowizodipagaz.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd2110bcdc---zafirosuwodasaz.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/pafefisipa.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/99319711703.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/tesexetubibife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=world+tv+apk+free+downloadPDF 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_off0000d0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 18236 bytes
SHA-256: 2072737ec3d9fec79e3ea8fefa193fd9b43c8e59b509f21581dc1c419533b447
font_02_sfnt_off00011823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11823 10468 bytes
SHA-256: 819602ae6f8ea309e84434bae6b4ecb22b7d3919cf4767fc83af5cb8ed8abe16

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