Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fdc4fed468112f…

MALICIOUS

PDF

75.6 KB Created: 2021-06-12 11:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b08d224accbe2f6fd847a1611810d8bb SHA-1: c2ab8e792e1909ba98fa551ac1dec7ebac4d501b SHA-256: 51fdc4fed468112fdd6ff6e257deb284b718832618f905d3a67bcdc23f6c5a28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised or disposable domains. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and references "Harry potter character development sheet", likely a lure to entice users to click the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://laborke.ru/uplcv?utm_term=harry+potter+character+development+sheet PDF link annotation
    • http://zaun-produzent.de/userfiles/file/92487213743.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/l32407ucldi9ubgg5gqdhrjlh6/sogeve.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/liwusaludusadalagar.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/4321132317.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976b84b8bd6---loneradelika.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e99c50e82---xuzazexozufulewinete.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f172e151c---nebimi.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd36c88069---29098036849.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7a6a00ad---risarunogoriva.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210608_058118A9BF701EE9.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1830c094a1d3e6945cdd385766618de3/nakorut.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/97190488838.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/32553800943.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/mikuwox.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1c5ja6adu9jvk473t65tpgnsr8/53093032056.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/cef5e000d466f64b7270345022a6e787/sozonubebowajax.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/zipeg.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9fe64abb439557a31f50ab316a96fb2d/49194194926.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 5436 bytes
SHA-256: f1c995dd44f7323e53b3a0ae29c3c6a52c97113997fac842e8903a5a425fc275
font_01_sfnt_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 10812 bytes
SHA-256: 83e0b1d1eae53afeb6add7a36a35cb4912c480c118fb470e65a5be1dc24efea9