Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e12ca58d8b12784…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 20:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b23514f9b9e847150926883aa1290c64 SHA-1: 34bb190192507ea8b05a9be921c1d2e0e8ccc293 SHA-256: 4e12ca58d8b12784815997103794dd9dd4c5864e30df9c38d1572753c1eac058
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This structure strongly suggests a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 http://xn--80aab8aioy.xn--p1ai/userfiles/file/39951676983.pdf In PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2c3c27cd8---pojusawagipuzedifopelu.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/92169078051.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/dopedozazuwokilelewova.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/c4b0d9bd1759d9dc6f87969106e36021/kagokipefegesofibatun.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/dqi9ot7i859q45o1hsg0ke74r0/3174058065.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611c3fdcc24f1---70697260896.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133121687a7e---75424931304.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/htskv9ev31s5q5pacm0lc1a59g/22198325693.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d9e39ffad---82185899851.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/tubufelajup.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a63d9954af7---92168345390.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/17141738156.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/71706728668.pdfIn PDF document text
    • https://menu2uplus.com/images/file/11736001427.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a0b6db5ba979c45b7d2d986afffcd5d8/vomoda.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/zerosiwabo.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/tagadixekoxowe.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/jizukoraw.pdfIn PDF document text
    • https://spacio.hk/attachment/file/62284102331.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/mibokopababejejokarilis.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/57522132554.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdc3c7427d---18202006686.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608210852f8e6---19778553029.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/jq550arr0gq3sdm0hrbkp74ugr/38676439327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=manual+gopro+hero+7+black+espa%C3%B1olPDF 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_off0000d8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AC 11044 bytes
SHA-256: 02ef7e98a8e7f85526fdd35f4c7453bfe9746ad45eaf3912d4b9b97eb05612f8
font_01_sfnt_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 18040 bytes
SHA-256: 9e8b39f1897ccc391598c4704fa0e1b30a0b4bb6b97f408a5f8778ae9a262258
font_02_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1