Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b895d9d74d5c923…

MALICIOUS

PDF

74.4 KB Created: 2021-09-06 18:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 431a106458801d874ae7cdff1dbba4a2 SHA-1: 94bea91d76a581d6a208cd1a0e0e0b7be2f15bff SHA-256: 3b895d9d74d5c923c8da4b074ec8be6e74676780a14518dacebf665e75eec238
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the ultimate destination of the malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7acd3eca3e8a79f08c779df32fdc2840/zazimuferawup.pdf In PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/25556630564.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/rojiwugavuzosuj.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/ccedacef0eabff03fdba5423c6d03b12/josiwumolusup.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/kubekumug.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b42f440b271---fasifowanogosapogisedi.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/linifesisuv.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7eab287b1f57ecb580ab8e928676bf6f/zavitadakuwitopitinolidas.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/b196f55e9299706a99a5e499bfec6968/tuzafogorifedetezejofav.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/47226493143.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/47515798270.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/welototokusudobavafifozaf.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/kakokegukizefosod.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/bhbk4mbp9lmlbrovoe96k8aptc/52328022074.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/758f1553e51d0ca3f7cff3f49c4b48ad/xogivuxusa.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16100141758fad---jenabebowuwal.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/kokukibimaduwaragimunifes.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2018d4dfb---xiletojojidojevivu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085c46cecfca---24194896290.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/fd3b227d0c05742e6f5544ef98aef738/zaviwivexilob.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/lixif.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/73188646496.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/109906d734d72a30dee1a4d44631927e/51701014109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=phrasal+verbs+pdf+in+gujaratiPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/44887726330.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_off0000c041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 16568 bytes
SHA-256: d7f0dc15d2135e4f5b1c19d7542fa32287a95ece263e2b0dc461785096aa3332
font_02_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 11096 bytes
SHA-256: 1a6e37591e275db55b4ac6d5947cadc0698d81aec748b392dcfb5d7a70911164