Malicious PDF — malware analysis report

Static analysis result for SHA-256 0411ec72f12209e3…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 00:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ad2999dbf33b7c663582f0487b0d8f9 SHA-1: 46b446c2cf4c6d84bd3bc39f5f20911952f8faed SHA-256: 0411ec72f12209e332f33d868d343264c0091d85fd5995a429c415db8860cc37
192 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to potentially compromised WordPress upload storage, suggesting an attempt to host and distribute malicious files. The presence of a download button lure and callback phishing pretext further indicates a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 9

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/88jblaks2c110e9v4gtf2ls7g4/6335372677.pdf In PDF document text
    • http://lixupeng.com/uploads/files/54508457060.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/fomemagewadujubarapeko.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/duvilazugud.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/puwefifipepajigojebibujen.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/42673889701.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/tadum.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/67093974938.pdfIn PDF document text
    • https://digireg.org/upload/gotajolepimusuxafanaxi.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/49497344079.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/83785658002.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4e9ab726021f5fa0fa10922150e73f58/54543717515.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/buxeluluro.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6130aa7d59df5.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/finobozenuvewofagineb.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/jepatixasi.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/82984125613.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5f5b5c6b63fb5efe386d738998ba02bf/94194181286.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/xuxowobuzemivuve.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/laxoki.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bda67e0514---91934616249.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/76801158424.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/41112712879.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/siwapagolulotunonemusol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+io+games+for+pcPDF 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_off0000b83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83A 10724 bytes
SHA-256: 6a3a77dbb4730092c37af4bee552ca75923e6f9e4900b6d715bee1ad87373fd4
font_01_sfnt_off0000d0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FC 16612 bytes
SHA-256: 468942e67317994bbf5396a761cdd90c11bf60b1a28df47c56009aab60165c33
font_02_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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