Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7227ecd9962b12c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 09:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b432ddf2cf4bbe76f6ce8485d30f3c37 SHA-1: 5a363c0f7881f0a9422cc417bfce427769a64836 SHA-256: f7227ecd9962b12ce7d3b74599b7c0df76b4e162e20f3de339039dcffc8aea13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://anpo.vn/upload/files/tewinapopo.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7ea0679f2---purugivixirado.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/zuximijigeladozoburuki.pdfIn PDF document text
    • http://unionzglobal.com/ckupload/files/nikumakikifugamamilaribew.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/96362708008.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/769fc496237881493f74589b48461fdb/rejuviwonukosirelolosufu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d8d3b9a08d6f77032c57c851c59d5fe8/suberoneravujufup.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b66e4c86b3---2211942016.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/rr51r1dglrla8762gfdb959klt/tuxajonogixiwumojasa.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ce3c4bd57---87582507804.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/moxolegafixugofod.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/62232173021.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/kemubu.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/25229831042.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/11611325700.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/vefujodi.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6660a67b6---51887797684.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210720_015449.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a2311cfe73b24881112586dbd377f636/76394274778.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/68129702558.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/rijoge.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a68eb0ab8bd---83471829126.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eea402980---vafupujafodemajegeribu.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/dekarakiduneluwureso.pdfIn PDF document text
    • http://elpijisystem.com/file/lovojakonovopataruzasizux.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/13339043352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=2+types+of+involuntary+musclesPDF 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_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 17632 bytes
SHA-256: 343da2a1cd2a35edb15a67a0d21bf9bb94747a017494f9a55284b12ae6576eea
font_02_sfnt_off00011c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C23 10944 bytes
SHA-256: 1d073d68fa15a38b3bd3d706e7a2612ae5f278d2a0c50081f4e78b7dc1778b70