Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34e832569e48e0e…

MALICIOUS

PDF

92.4 KB Created: 2021-08-10 16:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 61b1ff783d596fa2ae16e93d40b2fba8 SHA-1: ded2f20515e26e4429fccda8980d174a16c427c5 SHA-256: b34e832569e48e0ec2c953b7a3aae17da1e7118ad559f8d92aa6449803aa02ff
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lure users to download further malicious content. The presence of a link farm on disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160867e8db0de4---tetemefimepi.pdf In PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e71651bb22---lilovowaliw.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/evb8d7ajl4323pun2c2ka52rm7/warotadotimifupiw.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd97e937d9d---fifotupafoxokofumijipuwe.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fa5f2e7ef---2365281405.pdfIn PDF document text
    • http://ihdbd.org/upload/files/57391815898.pdfIn PDF document text
    • https://susta.vn/userfiles/file/tibalokawuwawun.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/k9tc15572ut0b1n3qj1mu4hlj0/kedesofuserikiva.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/lawufiwaxulufavo.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e7794047---11553548749.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/letovosovilutafuzexosut.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/vojilaj.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b1313201f75---46228446720.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ecfe8ed7a---3018285506.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d0a3129d---lofujekukunedobifujomo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160739cd3c92a9---nobixuxupapedilivan.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e41c1db448---13353362888.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/dokivesijutukakozomudumi.pdfIn PDF document text
    • http://bulmarconsult.com/files/lelapos.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/ff52f8b41df106bc4f3bda13c902a79a/sogaz.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca9b47d563---99434557521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=introduction+to+statistical+quality+control+7th+edition+solution+manual+downloadPDF 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_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 11080 bytes
SHA-256: 08fcd490732a5cf2de9b21ba20e72d23d479011d699a6dda9a4d96423edea888
font_01_sfnt_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 17800 bytes
SHA-256: 901d0d741637749a6956e0b309ae05b305a2ff6de0a8232e62e763a12122c21e
font_02_sfnt_off00014a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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