Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2534b0fdeea61cb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 23:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ad633e2aa8449e775cbf81259810c58 SHA-1: a4af75fa314662bcac2b9616fbd9d3e6a8c6b4e3 SHA-256: b2534b0fdeea61cb6b3986406ec5ffd8ff82cf78a1f08868275228ef1f9f9734
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF format and the nature of the URLs suggest potential for embedded JavaScript to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/aa3190d305bc026da24a854db7444c8a/ruramatuwabozizomuta.pdf In PDF document text
    • https://pbpkrosno.com/fckfile/79019608277.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607069d66e169---80447512243.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/rokiwikudinasugali.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1be4acc5df---tewexeza.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1ddfn5fhact4ev506cckvo96h2/tisevimifewizixel.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/2849655986.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ad23158606173dd9b28e6d87d36ea075/vozixutabanogosulima.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/b0ee5bd594cd936bb03c910ad6395920/xozovup.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/eb4f8cc77bef016f95ee98e612ed1acd/55959167591.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/sipevegorazoletizajiwowa.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/tarideminetusofo.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc8bc2b99---49212167597.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/b91e3035e73f1d85fc8ccb0a5a427fa1/77316335889.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/pobezuleronixamigemog.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16073f513c76bd---32690019539.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d7ff43160---70137312842.pdfIn PDF document text
    • http://concurs-euclid.ro/upload/fck/jelujimerusedaxode.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210819_145636.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/a12b0o1g7urjl6p803jhsu8b5a/jusuguxene.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bcd75a72d---giledobuvobefijaxejalani.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/5233ae056b57e92f8ffb0fe2cf824b03/noforimajito.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/50155584539.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/pupetuxiviz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=primary+exam+result+2019+pdf+filePDF 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_off0000d6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EF 18072 bytes
SHA-256: 5e803b4abb28e0db008d6ebff16c10bf8918e687b752188d48ee55202482db39
font_01_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E13 11212 bytes
SHA-256: 50b048dd34680071adfe04c22eec0e8f6a101cf3bd406a931f2d4f2c8e9be4a5

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