Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a5133ba3666ecc…

MALICIOUS

PDF

68.6 KB Created: 2021-09-24 16:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec61717c4cef2dfea4623d6b8729dd9a SHA-1: a2ca183dc37c407550193855b4f2b84b2740f0d2 SHA-256: 89a5133ba3666ecc8ded1b169b727215379a8d99cd6f28dcb2b24b0ac9143885
176 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with clickable links pointing to various domains, many of which are likely compromised CMS uploads or disposable hosting. The presence of numerous external URIs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://hatowo.com/app/webroot/uploads/files/gitid.pdf In PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/notomopamaxo.pdfIn PDF document text
    • http://yztools.com/images/upload/File/25485257424.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/gafesuzewovudaxi.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/bojotili.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/87876945323.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161417cbe32bf7---96004302211.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/bakunipekawerufamu.pdfIn PDF document text
    • https://iohrp.org/f_files/files/pumota.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/52071951874.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/87255580324.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/85747520283.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/xasaz.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614607a64cb28---tagubisoverubopowuzun.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109101913233747.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/68644612749.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/texagati.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210917_041522.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ed83e070bee7f24dc9146fec0206cd99/rinofebujusiti.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/21949905074.pdfIn PDF document text
    • https://toocapen.com/files/ropevazopu.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/2248436951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fortnite+new+update+apkPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/zugoxaj.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_off0000b131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC943 14400 bytes
SHA-256: ec0f78abbb84bdcfa4b1fe26631b66177ec9713382a2e02ee22bc31c23c0d6cf
font_02_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 10424 bytes
SHA-256: 52165dd8eb775f0a7c19f1352717a49070f96edd77651f0c8b6f2753b0084747

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