Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac078abbb6b18ff…

MALICIOUS

PDF

79.0 KB Created: 2021-09-22 11:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 64e1effdf63deaef64e9dd632b8fc3b2 SHA-1: 2b78220d967e40dbbff1f3243c33230f170b8ea2 SHA-256: aac078abbb6b18ffe0c6dcfb88b63d2b4e808515b388c83c4295c6e975581192
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, indicated by the presence of numerous external links, some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are designed to redirect users to potentially malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=new+apk+pubg PDF link annotation
    • http://www.serge-valentin.net/ckfinder/userfiles/files/12612795980.pdfIn PDF document text
    • http://rs-entp.com/upload/file/68038606612.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/19298341640.pdfIn PDF document text
    • http://bdnchem.com/upload/files/jejekagoromi.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210922100852.pdfIn PDF document text
    • https://webmenuplus.com/images/file/82963249528.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b409510df8c5e2bfbc71ca742c1d8d16/fasopiru.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/23978642836.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/naeds0l8ek61t1uebh3i0octn4/8397607199.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/pumixuwavuvomanuw.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136689217ffb---31524662096.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/rebusadi.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/33469401638.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/vejiretiboneluba.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/wijufinomafesubikamotosu.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210908041649.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/93578876972.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/24248549524.pdfIn PDF document text
    • https://music-group-store.com/upload/files/39290644402.pdfIn PDF document text
    • https://znalac.com/userfiles/file/pimuxawifiranikezizug.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/zibefivilazus.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210908_D7AD71B92DB77C6B.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffddbcd124---zojajudumopixasul.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/93290541159.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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 17676 bytes
SHA-256: cd8306a268037c29a6693a42b72ac9e9efcccb8d3420f392448e50ebd25b9a1f
font_01_sfnt_off0001008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A3 10092 bytes
SHA-256: dc0da84e08e41da690a930b8c282f1efcfd694100a970b85921f77a1709fde9d

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