Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba41d8a5426aa28…

MALICIOUS

PDF

78.9 KB Created: 2021-09-10 21:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 843396ec7576ce1e9893ff9a705d8807 SHA-1: b621e0d494d6516a0933a2bbc9afebc6880fcd99 SHA-256: 7ba41d8a5426aa28968095801a09bd58baf8f56dccdce3e705eafe8143f83b7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing infrastructure. The presence of a 'download button' heuristic further supports the idea that the PDF is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 https://crewmak.ru/uplcv?utm_term=frp+8+apk PDF link annotation
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161359f1f9f324---vezozabozuvilozet.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/zawatatodu.pdfIn PDF document text
    • https://emenu.hu/editor_up/25361651255.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/26021154443.pdfIn PDF document text
    • http://fceresources.com/ckfinder/userfiles/files/dasapaxedanuxuninapojor.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/92725442272.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jjqvjeke5nrub24b8qce63lc84/82949035320.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/rajovuletep.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/romunubegujedo.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/ronotonufatoke.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/22168438492.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/37865221704.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/fewanoruvabonojix.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/28699960032.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/89778541706.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/51786769692.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26018737781.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/77505835084.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/boxejoketapu.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/jekisuruwowitekokisilonig.pdfIn PDF document text
    • https://ijp2.com/contents/files/99679454998.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da505185d---9501115467.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_off0000d186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD186 9764 bytes
SHA-256: d5fedd439ce66e6df055a84acc71063f380f54351f49fd57eb492aa8cfc8679d
font_01_sfnt_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 18244 bytes
SHA-256: df80839344509bd05c3e7230cd212a256ffb84cb40c2a8d958edd474354968df
font_02_sfnt_off0001160f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1