Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bb4a4e24327b03…

MALICIOUS

PDF

70.4 KB Created: 2021-09-24 13:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34bfa68cace3d5c919bd65e54af66148 SHA-1: e8a73c9a0c6d9beb38f857af3ccc87343dad428e SHA-256: d7bb4a4e24327b03ee2b7e1f0ff996452b2f0b401e06643b3035553ddfefdc59
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms the nature of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://drafthe.ru/uplcv?utm_term=looney+tunes+dash+apk+download PDF link annotation
    • http://rsti.biz/files/fck/file/zawikejuraw.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/7328462083.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614214cfb471c---66737550796.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/76822610582.pdfIn PDF document text
    • http://bubb.cn/up_file/file/tegemivinoveja.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d05c237abd---40680129852.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/degalod.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/75328287302.pdfIn PDF document text
    • https://limsurempat.com/contents/files/81215221942.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/85419208595.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139dcb7c43fd---51888603665.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/53112756896.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/52257194403.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/23718804322.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/98028793204.pdfIn PDF document text
    • http://sireny.net/share/files/danavagagina.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/30140927695.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/remurumedezenig.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6bcd9bd68d9118e4e221cdebb349fe28/vubefen.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/1092083101.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/23838941314.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/66296982241.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/zawenax.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/wowefuwilubigoruvupaw.pdfIn PDF document text
    • https://megashina24.ru/files/files/31488040144.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/98276553211.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/28327330289.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_off0000b631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB631 14740 bytes
SHA-256: be67ccc9394ffda6bb8d085217917ef722af12b9070052ed1e1982cd4567e0df
font_01_sfnt_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 10644 bytes
SHA-256: 4a3e8edeeda72f1baa0434b55429901d46f0d2fb5e9773184a7be5596a08e618
font_02_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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