Malicious PDF — malware analysis report

Static analysis result for SHA-256 691273a79e6fa509…

MALICIOUS

PDF

92.5 KB Created: 2021-09-15 23:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e02729e12fde0a2455f662f7f59a23d SHA-1: 66157b0fb59508d0d72366267e0ba8f007c5bc84 SHA-256: 691273a79e6fa50970a34bcc53fd67e8b0f79a87e8b84211c6f6bf0c89a7c427
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16130322f61974---38915978153.pdf In PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2d85caecb---22190143274.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/67898715081.pdfIn PDF document text
    • http://prograsifkalip.com/files/12423769182.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/35482062678.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/lt5urnojn4et21enh4hivs7535/81200123071.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/godubijeketiwewolanowiku.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/30353494366.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/2388388994.pdfIn PDF document text
    • http://101balkon.ru/upload/files/fegujemetumoruvurotig.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/4364077021.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/59410652065.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/jususenemuvunirebede.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/56060435452.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/9dis874in3paaopc0hfe3et59od0hbq4/lowojiz.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/wofudizizizilak.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/pegifipodejuvopiru.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/wevemo.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/71563074437.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/wuvuwijotuzomigijiva.pdfIn PDF document text
    • https://shunnasato.com/24531388687.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/08/50574057573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dbz+games+for+android+downloadPDF 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_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 19244 bytes
SHA-256: 866835ebe74241ae0bc3a14dd89ab55cc584675ba26bcae0ed94d979ece7d392
font_01_sfnt_off0001334b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 10888 bytes
SHA-256: 61e1da95c41b0f7ed2f493fc2e54cd903ac4f335d0ab89cc7bbc3aca1263d433
font_02_sfnt_off00014c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1