Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17b414b6dfe03c4…

MALICIOUS

PDF

98.2 KB Created: 2021-06-28 04:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: aeff912f451c422276e7e47d24aba9f9 SHA-1: 7626fea850e9bab20d1e94e746c078a5d6ba653f SHA-256: f17b414b6dfe03c41cfbff3c2b1a4227a63e22aaccbbac1bd81cd0a8dffeba4f
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 6

  • 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.
  • 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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7377968d8e---sofimebuwozimuzusota.pdf In PDF document text
    • http://medob.org/SITE/files/editor/file/ruleletumezimizikimi.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1086eb139533eeadb8751dbb983213db/wofuvokinatonupefoviveb.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/47824092661.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16090f68024c78---75146293840.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/39197837445.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/afc705a5cf3bbe06f6b36eedb50d2f82/migegeworawurume.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e8b103854613283fbd9f32b9ac0f456b/temavisugogofudab.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/613c0f0a67d53002c89208de149e5d5a/tajobalolavuvewikeja.pdfIn PDF document text
    • http://deauville.ru/files/file/81365676701.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zubokiwemawaze.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/3g1t1pee39m3d9aku53lqt0i9v/97458669048.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832eb178beb---sudovomasekuba.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cad919d8c49---vugasowirugowibotevemu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c65e993794c---febafa.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38e4971473---rugebe.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tnn1k1pmocuvgl1pi8rkcusmtc/molezerevof.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/76436614371.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/59514973724.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ef4adc1f0a30e1320062eff4e46153f3/73730354979.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/75adbqb1pcupsre11d6tf9c6tl/59847941876.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/38074090319.pdfIn PDF document text
    • http://sport-way.ru/img/file/12041225129.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=summoners+war+private+serverPDF 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
font_00_sfnt_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 19820 bytes
SHA-256: 28382812be21a4a82213f6b6afe4002285feea2480e73a1e5a0fa89ab67db5c4
font_01_sfnt_off000122f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B00 3464 bytes
SHA-256: ab430045ba5a94791c45c8c87ebaca6374d039af1ea5371a2a4deb0d3ff8d9be
font_03_sfnt_off0001487b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1487B 10696 bytes
SHA-256: dfd13c82521c126583c384618cabf58660a7eab9bfd933ad12bf386f30a8a19d
font_04_sfnt_off0001610f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1610F 16816 bytes
SHA-256: 7f8e1cb1d5d9cd19cc3c839743be1225e966cf4f9f06ca11f531404b0bea3a0d

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