Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d7cdb439ebb262…

MALICIOUS

PDF

77.9 KB Created: 2021-09-04 04:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e544c668b6d7215ef9fb56af9190e288 SHA-1: a05a57c7d736b326f15a639b9263b7b8ca03aa0a SHA-256: 52d7cdb439ebb26200548ca8b34ab598d2dcec2c9effe1a840a10f07d7991cb6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads and disposable hosting, forming a link farm. This suggests the document is designed to lure users into clicking these links, likely leading to further malicious content or phishing attempts. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://sibservis.com/ckfinder/userfiles/files/sajikamunakironigoxal.pdf In PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e0011e5cf3469f3ce93bee27e6041767/22822097559.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/17361181075.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210814165321.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/5d1261adcfad42c5c48553750a1fa05b/pigovaderemavokunukefu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611521198d50a---75691964822.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/sb547n3b3qfjjvhqn14psu2ib5/pupuxuxivepika.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/vnu78kkq30bmhv9g52nj14g20v/24048560767.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6djkjn703i64q6t6msp823voq4/sukelotupusalonani.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d315c62077c95acafabaf76ad6486a32/9137822128.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/jidibegonurigimogidof.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/52533932535.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2de2133e6529ed7f47462eef08463b0a/kifov.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/sidanebuwojif.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/rs8li58017lrdqglurk8qmqs94/58585176539.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/74725153034.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/tikowotebajitasogiwixojeg.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/802747659.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611371e2aa529---55914375508.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/87771967616.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/fegataxitomibidilititogom.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baf9e43f8a---seravadikola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pdf+to+word+online+candyPDF 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_off0000cdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEF 17460 bytes
SHA-256: b4a62609c46ff0d1c8000484ec7691f6387f0fe2f06f9af5e59e85a7f4938fff
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001124f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124F 10504 bytes
SHA-256: 7881f10bc4ac81dab513d9830b2568560185eb3466427f6cd2e440d4f442313e

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