Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e03312ae5d40d3e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 00:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d9ffb8995c027424cd4b068ea2d3cca SHA-1: a4fdf9a4fd5dd3def1454bded9cc8b958ad9c201 SHA-256: 9e03312ae5d40d3e4b3d46c6f5765f9911bfa1beec69529085f62809225596ad
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 embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier strongly indicated maliciousness. The primary purpose appears to be a link farm, likely for SEO manipulation or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210902051842.pdf
    • http://beachfirebrands.com/userfiles/file/lewidofud.pdf
    • https://bnovum.hu/downloads/17702229971.pdf
    • http://alhouti.com/userfiles/file/nalubulusozanapevuvejik.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/dobemabepiniz.pdf
    • https://ctapigroup3.com/contents/files/22860957708.pdf
    • http://labradory.pl/file/79046874724.pdf
    • http://globalbizkorea.com/userData/board/file/80689977411.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/fpegj6pj5kcvk94on04v0hfg1o/parupuluvir.pdf
    • https://biholka.cz/uploades/userfiles/file/87660998500.pdf
    • http://flapboxes.com/userfiles/files/6743225721.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5878b6a76d5c1dc1d175133d5c5a79f6/zonudorefiwen.pdf
    • http://print-printonline.com/ckfinder/userfiles/files/32666694986.pdf
    • https://autopsrus.com/ckfinder/userfiles/files/zenifelilagodadidazub.pdf
    • http://progettocecinacuore.it/writable/public/userfiles/file/wunejuxila.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397a405a670---duvadapiginipujifu.pdf
    • http://architects-desk.com/uploadsfile/58787055811.pdf
    • http://jiji.pgo.tw/pic/uploads/files/nenibopotobolozo.pdf
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/fefefevavetanitugana.pdf
    • http://plenaseguroseprevidencia.com/fotosempresa/files/gisenumukurek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+stop+outgoing+calls+in+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2ad.bin
27cf0881a7e650846c6524289f1cb9798f3b3c4380de2bdeb871aa31119b7ee6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AD 16024 bytes
font_01_sfnt_off0000fc27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 16792 bytes
font_02_sfnt_off0001143e.bin
95d50545884123d87a538915fad6a62286808ff74c8e77a90f6cae294a807057		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 10732 bytes

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