Malicious PDF — malware analysis report

Static analysis result for SHA-256 c517f079f2ded9ea…

MALICIOUS

PDF

94.2 KB Created: 2021-07-05 08:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57f2b84146a066840a4f1cc24bf54bb8 SHA-1: 63704c05331f4d25e92a170dd6b91c59b7cc2534 SHA-256: c517f079f2ded9eaad0437621cc4be8efcd10d4314dae298ed62717fdc459866
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • 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.
  • 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://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/b504e63d1671e3928c648fb4ea37644e/85355511845.pdf
    • http://prociweb.hu/sites/files/file/26510751750.pdf
    • http://tourister.kr/userfiles/file/8802434746.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd487d73d05---molulipele.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6flis5havv83h02gi7nbjtsbf2/33560831342.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb31419ec7---zojaso.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160717f27cd616---tezodezef.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/c3nv4u4sgern61jkm0s4g3kgkn/53585414199.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/a574ed23b0ac227ce822b12027f85422/37117240961.pdf
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/d62be105e02fabf11dfeb5a7c10522b9/13261418248.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606da3077b9f8---rotujafukadad.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/c4038ff6a5829b35d745752c09eb833a/8284097418.pdf
    • https://maconlux.lu/userfiles/files/kogirazofekag.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c888d8a1c08---64476927167.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/a98dbfb77e8eb8ffaddb8f0f4224f542/beramofuguvuvek.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/rfb18duh9oqj6h090h8sqrtbb7/lotidibifudamuzinekedatoz.pdf
    • https://mn-lawfirm.com/box/userfiles/file/gebujomeruvajilovefo.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b28324b8538---18158230447.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/8m0fimoc3ot77dttum52rp28l2/gadotodogitarowo.pdf
    • http://bbfederico2.net/userfiles/file/jobisifajesufumanebikik.pdf
    • https://summit-christian-academy.org/scauserfiles/files/lobidur.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/95a991056503bd93f1dba2dbe1b78817/finuzanujonemeg.pdf
    • http://viajesalaos.com/webroot/img/files/33865045829.pdf
    • http://esistore.be/userfiles/file/kobilusarux.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/3r942u7joq3a90eglbqcfvda88/9838894076.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=drop+forged+steel+strength
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110b2.bin
75b435442e035fb74bac939fb71755724a25785daa989c5d06bfd51557967a15
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 16612 bytes
font_01_sfnt_off00013bbd.bin
e9288d2622203c1d3de7e3befcdc52ea415fcce1e024b5ba8560a5be195d617f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBD 10524 bytes
font_02_sfnt_off00015361.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15361 16792 bytes