Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77773ce996b8555…

MALICIOUS

PDF

81.7 KB Created: 2021-07-07 06:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 60304ed9ca8984a11b9cf745f2a3559e SHA-1: 39d96f05cc4d8daf1cb7acba113d9a0b4cbafe09 SHA-256: a77773ce996b8555a4843899b52d59e856f94e5bb4fe7919d93d98bf036d2c90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malware or submitting sensitive information. The presence of multiple links on disposable or compromised hosting reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d5c12d0893df5d413f13b06f62e528cb/20948544147.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97253bbda---27701160467.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/jm8er0df2lcpr0r0cic2qgmavh/nubefewibo.pdfIn PDF document text
    • http://aa-nusd.jp/47346224929.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/gamewivunasezinu.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607e346363e19---japovirutu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722e31b1040---83439240336.pdfIn PDF document text
    • http://elijasprojekts.lvfiles/file/77016600962.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/64369871807.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/pqdv94sgo95qsq1laopdlfcj8o/relaxifirojidotezepisefi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9147d3332570a6e754ea1b3b65da6b18/jusedeluworodulamexi.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e2ce902e81c1dd3d43913f018911980c/38995247851.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160acf6204d40c---8518123798.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/tegodudebafabenifovej.pdfIn PDF document text
    • https://kimansion.com/uploads/file/sipopolarolerotedanov.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094da8603c5f---70383084552.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/71348188894.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/90302488868.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160828d03752a5---juvixiv.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb2dcc0137---kagogesodanoju.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/suloxabilebipokoviporaliz.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/47759933907.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/82af32826c64afec6d2c40507ed0f8dd/wojupokaxobofikufap.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/kojinalojolusifuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=upendra+sir+notesPDF 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_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 10344 bytes
SHA-256: a782f0250b98d1b8f0ef6f97c6dbe7ee548caa98db61fa4d011df39490c596e1
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 18656 bytes
SHA-256: 1464afec02165ee38c38851fb59cbad4c89f2db8035df143b24cc49a927b29ff
font_02_sfnt_off000121df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1