Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd0eb7e4d445bf5…

MALICIOUS

PDF

88.4 KB Created: 2021-09-07 23:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 647d5cebb97a7b90e9c2947946ab5c6f SHA-1: 0b31a3943fe32ac7f90b353f4dedba1779bbd4df SHA-256: 4fd0eb7e4d445bf5b21c139308bd7d4624017dfe06bdc38bd4272781d5e19132
164 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to other PDF files hosted on potentially compromised websites. The presence of a 'download' button lure further suggests a phishing or malware distribution workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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.
  • 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 http://perles-del-beya.com/userfiles/file/5444698922.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bb94fa7f1a7---52503997304.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/45d47c63fdcb1f5b66b78378e56e5bec/katemejubesazomazedur.pdfIn PDF document text
    • http://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/5997194392.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/xixeje.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e2b4fa7ed50bcbf6b6538e69cded81e5/wopelula.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/p8igat4ggqrtm15337gnuiqti3/50495100941.pdfIn PDF document text
    • http://asqcert.net/files/files/sugolufinawoxatojolum.pdfIn PDF document text
    • http://signauction.net/userfiles/file/79307505293.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7072c28539---vipinoxidizirukakapetow.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/27057783409.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/befemuneperi.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/39722515015.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/ed0853ea61a2278f2b7146901426edd6/kobewogitupama.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/70f32158a9580fdce63c8446e207015a/4169896763.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f71faa455e9349d7fac5eda601039f8/60570486553.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/391553b779f13be63e0c94e5bdb5f7a8/gexazodoxipakoruze.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/29484546497.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a062cbdea791f17f7a92b640e92654cc/xalixaboso.pdfIn PDF document text
    • https://unaizahic.com/Files/files/4213226873.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/14224454350.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/cj28h9r0ibsu2gu9p0d4jnfn6r/73210437811.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/gulel.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a23ad1da91700ca0f2e7c03e7c4965e0/wozudunilezanuzonibitidir.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adfd930419e---losome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=rrb+heat+engine+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 17368 bytes
SHA-256: 597df6bada935255cad37a5385dab4081dcc6a79c625a6b1049487ddd4d22501
font_02_sfnt_off00010ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC8 10628 bytes
SHA-256: 245cb957cc9121f308bc68a5c15cee53ee0466d2b1db8ffc2a6576d1e0077782
font_03_sfnt_off00012293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12293 18824 bytes
SHA-256: 156b4a91e1aac626701949fa356552de1783967d47f3707cf61e8d9968f317d7