Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ad84605458ddac…

MALICIOUS

PDF

91.4 KB Created: 2021-07-03 14:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13eb93049a88e2a9c6b738f5df88db29 SHA-1: d8c2ffbf8ec23bdc8aa5fc49781397dc481073d3 SHA-256: 66ad84605458ddacc2dcad95ed52929d87e949557acb51e3bc436ef0c20c417b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are typical of initial-stage malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=how+to+get+itunes+music+into+imovie
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/13b93q4u6a636k7o179sfdtk16/fiwukeg.pdf
    • http://landpas.pl/upload/file/69784155801.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c1172074f7f---20148507426.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/097cdce62586308abd05daca7465de12/84936574590.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vf77oe51dc2htgta98uio9kjti/vemidotibe.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cb204478d---410726735.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/mudemapi.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/4aed74a988d6e40fd599181394454f96/94927613853.pdf
    • https://shopinhome.com/ci/userfiles/files/juwuzixosenosoj.pdf
    • http://globalbando.com/DATA/upload/files/202107021608035675.pdf
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/88114398257.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/ab7af941c22afcc2b7cd3d6e1bb6be38/paxanitovovekudapa.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a674ce531c---bisoduna.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/10802349660.pdf
    • http://alumcity.ru/userfiles/file/sepirutap.pdf
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/ojoqhmgs9tg7lbmum3043n0gt9/nabodapusir.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6defb6044---2225408999.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b99bc1509---pirosapixujari.pdf
    • http://vickerycarpet.com/uploads/images//files/24022110944.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf16f46f9e---birixujugulokesitilujevo.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e596003c9d---gemaro.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/5aac213b2dafec8579a75997098d6e50/16270898181.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bbb29bf98---65071912789.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/33852a6adfc415741d45fbd4f8db2616/48839078224.pdf
    • http://www.kilincsweb.hu/fileok/file/36823079195.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ddf2c0359d9e6612f457b373230b693d/segisogitizuboderujos.pdf
    • 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_off000103c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 16792 bytes
font_01_sfnt_off00011bdc.bin
ffe33e5e100b7d846b9327674164e7f4a6407796cebf4c2a2e5e093423fe937d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDC 10508 bytes
font_02_sfnt_off000133d5.bin
7a0cd967f86857b64b9674fdfda0440228e4ee0417d16167294f788745d15073
pdf-font-stream PDF embedded font (sfnt) at offset 0x133D5 17084 bytes