Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01a0fdf1e148370…

MALICIOUS

PDF

73.2 KB Created: 2021-09-19 05:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d12f8e06d0f550821ddcc0d0611bd6e3 SHA-1: 7c412835b1403c08b7e169eaddc21a05ef46df96 SHA-256: b01a0fdf1e14837097021a6d49dfcb3f7a1254c36f43d6ef31e00fa6a9e86251
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://philabc.ru/uplcv?utm_term=random+debit+card+generator PDF link annotation
    • http://cephedanismani.com/images/pages/file/54883532695.pdfIn PDF document text
    • http://sjhtractor.com/d/files/jokudiwup.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/dikemunuvonugutuxe.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/dikepogemotab.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/48187991543.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/vunifupujupuguporezebe.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/tozovozusopisebaxiberijek.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/xasexepagaluxixiwu.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/25199570745.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/17729212008.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/20784177906.pdfIn PDF document text
    • http://baoveantam.info/upload/files/49360335712.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/54272297526.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631118614.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/favododo.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161408f342737b---85255175264.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137cdab64e87---8206449140.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6654f32a9---ramawagusasoreme.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/95944818733.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/78331533695.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/71236919876.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/8219220802.pdfIn PDF document text
    • https://gangnampools.com/contents/files/77376087283.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/kodefadan.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/3998503750.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_off0000bc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC69 10684 bytes
SHA-256: 6d7f2724ac1dd4bd23a4dbf78f74947938543af0c03a25cc5ab69abb7e831814
font_01_sfnt_off0000d4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 16552 bytes
SHA-256: 4472ec7bcc953fb47194912b01e233c6b20d3591eb2282f12a7e952e288e9d10