Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b87c1d491fc01b0…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 02:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7bed8ce5279118d52185cce1626bd8f SHA-1: 0fd5a56658c716b11ac7201bd5d18bcdf5b2151a SHA-256: 4b87c1d491fc01b0eb2e1c4287148c4e8cdd095d1eacde7758022af16706d124
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. Notably, the document also contains instructions to disable security software, a common tactic to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://allytemp.ru/uplcv?utm_term=adb+frp+tool PDF link annotation
    • https://elegune.net/files/galeria/files/xilenulalos.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/kafaw.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/pejenivugusisizirojenoze.pdfIn PDF document text
    • http://elskenecologie.nl/files/7769436759.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161401bb6c9b4e---86544890422.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/giborof.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/rolitar.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138c4853ad6f---torenopobo.pdfIn PDF document text
    • https://777mto.info/contents/files/42723339390.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/97141185129.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/94716330936.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/kajutemuwiraku.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/64717858605.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/33232440585.pdfIn PDF document text
    • http://e-sportis.com/images/upload/lowadiroj.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091401404899.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/povuw.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/datazufalew.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/74312461537.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f946163a9b---35130213248.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/rovevugif.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_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 17876 bytes
SHA-256: 2e727a49c2590750f5130fb437b274a2b684a19a2d99644298d55f7a792a3fe4
font_01_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A31 9952 bytes
SHA-256: 6bc84962a264b2f8bdb9d44939cae2824a5eb2b433b41be19449cff5b0d22062

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