Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcec53904d53459…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 16:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7cce5bf02a08f952fe9a089de9ab1a8c SHA-1: abe99d8cd99379caba1ddf5f499ebe509705bc6f SHA-256: ddcec53904d53459b473a331109f9ecc1cc60cf856a0a025e2d9b49e1746aa76
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into phishing or downloading further malware. The presence of multiple external URIs and link farm heuristics strongly suggests this is a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=tilapia+fish+farming+south+africa+pdf PDF link annotation
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b318c2866f3---29692624925.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/givex.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/kiranaxapavetunev.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d10729740472eff3a575884eab123174/65411984934.pdfIn PDF document text
    • https://rajaunited.com/contents//files/donujexe.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082474e8bef0---72508114631.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/jejujasoxawomajiwozopube.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/pivasoxenesimiponorezor.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/pubajigizapojitomosure.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/8021808166.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2278cf97669803a5058bfa51ae099d59/wadixetivoz.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981855d276e---kunegojipug.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/38900512447.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109020804583485.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fbb6696e1---mafabosikelutenamorixu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/obncctb02sik9i33d1v45h6icm/ximekowefi.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/64405619229.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085e74e715fa---12083923443.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c454ea28a---novimewugonufegad.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052100201442.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c342b50b0c4---bawaxedexovefoxudamasami.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/10636586276.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849e808da77---81062407631.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16091991733500---43327277512.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ee476f317---vaguneboxikuwimu.pdfIn PDF document text
    • 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_off0000be79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE79 16352 bytes
SHA-256: 09c441bde7543ac696a0ec21fe27814448e7c6cdc319c588d54fdf8bc65d5651
font_01_sfnt_off0000e8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 10996 bytes
SHA-256: fb5e242e71a6f091ef5a232bdc6d6f923ceddd0dbed789b97e0dafde13fe1147
font_02_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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