Malicious PDF — malware analysis report

Static analysis result for SHA-256 d672717554d6ef8f…

MALICIOUS

PDF

125.2 KB Created: 2021-08-20 12:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: cbce4d824c020833e6f455f6f346cc67 SHA-1: 8eee688c26e7f9b7780cbcb8c34e3e03103cead9 SHA-256: d672717554d6ef8fbf7f5f25e8e5f7459c1562009382c31d9b6c7bcd034914fb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://oniceh.ru/uplcv?utm_term=what+is+sayaw+sa+bangko+dance PDF link annotation
    • http://kimyasaldubeller.com/upload/ckfinder/files/43378515401.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/gajikadukibuwujuruletow.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/zemiximelosa.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/66976901432.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a02971b0626---komituzemapepifoz.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/98011244691.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3ab50d2dfcc79f068f801884000adb74/39302548856.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6db236a19---nopotimajed.pdfIn PDF document text
    • http://maihome.hu/admin1/file/kinafanonifibanuwuxijamuf.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/wufijodudoximuwogafuwib.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021716233808489.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/63421682013.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/maraguzukexuwoziwadora.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/99858168382.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e16b49e02---xerebevajolosiwu.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/watemakim.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/zekagudawamezap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f13574ba266---7339315633.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5c05d7e1bd3bec8c9abcfbe67a730fc9/89355268282.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1611dace3c64a4---xapataxujubepo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3914f62685cec496047061587372b7f3/35124996116.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a60d8234a7bd66c416f07b67c2cc4d9d/digolevasubavewefu.pdfIn PDF document text
    • http://raczcsalad.hu/files/teludimopuxevifotododunem.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/4r18kmcjsae5801b5sgor7hhr1/7775687247.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161113ddf4b051---86463933570.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_off000185ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185ED 18060 bytes
SHA-256: bf72dc6514fb3431764d361a1d58ada97400de27350cfed53b1a786194c8d1f2
font_01_sfnt_off0001b4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4F1 10928 bytes
SHA-256: d1e37f7af81a239f7b541e2a08bf12f8b35ba48863d0ac96399bc5cadf38e522
font_02_sfnt_off0001ce1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1