Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a283af37e548a35…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 15:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f77ee88f1238e870934d529472b83adf SHA-1: cf4f3e195cee5ad0519c4f59dd11c43d26f399dd SHA-256: 1a283af37e548a3540b11a4d0b394070918ff36851ec12ebc1fa73e43d1b8572
172 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains embedded JavaScript and numerous external links, some pointing to other PDF files hosted on compromised or disposable domains, suggesting a multi-stage download or phishing campaign. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://clinicamanila.com/ckfinder/userfiles/files/rikolujimaxowinexeger.pdf In PDF document text
    • http://fongyoskert.hu/userfiles/files/47229657445.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614218b73a10e---konuguwulaforuxumunema.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/buwujimikapivomo.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/l3o5jlae0p1rrnk3q8mgekjp35/tetokaju.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/55313094691.pdfIn PDF document text
    • https://netpage.info/userfiles/file/kujizobozimanofimajinomab.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/71928272474.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/26301212354.pdfIn PDF document text
    • https://endobible.com/userfiles/file/78292434314.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/8512189531.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/newabex.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161425db9c1020---72736711190.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/jadipobekitemirexijemubub.pdfIn PDF document text
    • http://446888.top/userfiles/file/logeraxe.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/zumufimamavirupifaf.pdfIn PDF document text
    • https://nada70.org/userfiles/file/fulenegumefesakosirepoda.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/sizojeburolejameji.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///50649577386.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/kibofefateredatubirapo.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/sajewam.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/visatovedumibodododazosi.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/54215f6f5e282ffebdad7d26cd1aa6f3/subebadugixaj.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/vv3kk63tsbn54pl4oep1uai4t2/81693158663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=resident+evil+mobile+apkPDF 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_off0000c146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC146 17440 bytes
SHA-256: 07b2341d32be9105e0106b1d6644b04e330c401f1a622feea9c5ba468f3490b5
font_01_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 10796 bytes
SHA-256: b4e5e54d89e2939ac477cc22f648de80bb92b618e507565e548d5a23e1068746
font_02_sfnt_off0001070d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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