Malicious PDF — malware analysis report

Static analysis result for SHA-256 924c52e54f39cd14…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 01:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6203d0c4d29ba3cca500d5695ab8fbb9 SHA-1: ecd107c8ea3df7d9a0124572b83bf1a9d9799b47 SHA-256: 924c52e54f39cd148b532f08cecf197d97745c02981ba5c58429c5b896f44d1e
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jonme.net/ckupload/files/1073931426.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/0b8c5d3a760d1765df2abc0a651b223d/56141731944.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/zunonenorokasefewoxifo.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/92791569592.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/tukepomuxibebize.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/wasuwusukibuvewuzaxawepi.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/nukegegadatij.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/84308448689.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613415a408354---tumedafo.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/rasujanulemurolusopukov.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/roxevite.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/33252542504.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/43045dd60cb1eff3b93d6970156e4bd6/76964613757.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/benilowixogiga.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/bariwarapo.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/88643075732.pdfIn PDF document text
    • https://electroagro.es/pub/files/29606442075.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/38908602516.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/xexidu.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/miraxajomonorikadikav.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/42971976967.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/nukomiduzexabet.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/00106a4e1dbbf44ea9f2944d8307b631/bafemixewaxavalosifudilu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614524335ec39---77992643268.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d1aeaf281c50c3eba00c89f5472eef58/lakudavolej.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210910115510933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+set+apps+as+default+on+androidPDF 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_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 10668 bytes
SHA-256: 88d8d03d4d8efdfcf387b1fafd9eef1f3cbce08108992c04f15422577cd21688
font_02_sfnt_off00011524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11524 17308 bytes
SHA-256: 50056b5b2b75f0fed69b6b1b39f579cee9a721a30df22392c87c5083e729422d

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