Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a68c41cb42f9bbc…

MALICIOUS

PDF

82.8 KB Created: 2021-09-14 07:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 937a8afe013e2a4859e26db88c4e7811 SHA-1: b40d54180d1977d45d56c4b71155fad52b0544cf SHA-256: 7a68c41cb42f9bbcb7445df9f9e5c264934a50a1ea49a144ddc3543a4c5925cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on compromised WordPress upload storage, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc8e5858b6---tuvonefokudodurojoget.pdf In PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/55920782790.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/xumovemerikadagotunagonoj.pdfIn PDF document text
    • https://iohrp.org/f_files/files/63309646648.pdfIn PDF document text
    • https://ptogel1.com/contents/files/91022884999.pdfIn PDF document text
    • http://hanleyresources.com/images/78267414378.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/46693995238.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/bikososafetet.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/nawuvidanax.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/darikilekojixapibugi.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/xuzapa.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210911154916-kakibifezo.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/sudezafexagiwusur.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/53184037100.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/314126020.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/1927017137.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/bawijo.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/5219451791.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/kusuvadagikuvugedujikoxu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f735973a82---9597238096.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/v8ot5j56s64e6lveua0c0otoeu/96598862330.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/1158024815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sea+battle+2+mod+apkPDF 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_off0000deb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB2 18020 bytes
SHA-256: f97e24cc7f5fe323015ed0673e20b99c57bbb8ffa9b18c3edf1430f9dc7659b9
font_01_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 10516 bytes
SHA-256: 4c6b44ad7297355fc0943bf75395938e607488ed2bb2d46ad5b72a8992f75fed
font_02_sfnt_off0001259d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1