Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7dfbffd05638ff…

MALICIOUS

PDF

103.4 KB Created: 2021-08-24 19:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 702bfd2274dfa37b7c0a376118af17fc SHA-1: 1f46f8bd21ed1e15225db691b5a0cd38f617d0b6 SHA-256: ae7dfbffd05638ffd2e4132d1c2671652916865f5ed07cc198bd3528bc5db9fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely to manipulate search engine rankings or direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98ccd8544---kogekeregituk.pdf In PDF document text
    • http://fonnepal.org/userfiles/file/67304888043.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/wazifemogesexibo.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/99126331944.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9233d15cc8---wawisetusitelomevatuzuris.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16089199b48efb---mizuwilotovizi.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/90003032744.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/2051069873.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/3imo63ro5u5t2h2mtbrsb3be2e/wurebira.pdfIn PDF document text
    • http://www.polni.si/Images/files/79721643802.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/99762443519.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/zisugil.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/zurumemukefaxisekojuxur.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/98925760146.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997634947f9---punozotevugifadomuz.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608759fea740f---vakumis.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e72525d058c---xobegufajijipew.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/jalelixebesa.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102ccc2caeab---83731969010.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/kuvatekituwebibenapedigar.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///34127565973.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9161a0f95---xovuvododobenerijolop.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/73575669885.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe324414564---44024903156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=meaning+for+liaisonPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off000154d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x154D2 18960 bytes
SHA-256: 82680bae2d1ba92f1a018005c8df74b0a6c8e7bc3b4b189475ef03003de25c13
font_00_sfnt_off0000e6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C0 4304 bytes
SHA-256: 7b18254e5b713728be708298d8389a392ef2b598a0125588e9d4d4bca7f927f8
font_01_sfnt_off0000f6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DC 10284 bytes
SHA-256: b653bce6591b61a5ca8a92683d0e1c257dd29b278178448c1562883748511a47
font_02_sfnt_off00010e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E10 29464 bytes
SHA-256: 54e48caa1152170f200c099012669741932094965561cbbe21eb2a4448a9e072
font_04_sfnt_off0001749f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1749F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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