Malicious PDF — malware analysis report

Static analysis result for SHA-256 19956dff97971340…

MALICIOUS

PDF

84.3 KB Created: 2021-07-24 07:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d1f5ac5927b5f1ab4988a7db348a1e90 SHA-1: 6aa91a5f65811e662659da108f20d106b2ffb3e9 SHA-256: 19956dff97971340dbdf5f0d8801a9b4e36ce278cecddf59f16a9e3bcfb16247
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further payloads or conduct phishing. The ML classifier strongly indicates maliciousness, and the presence of these elements points towards a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/3ca0e9ef0106ec2a0d86c6061783df1b/xozimixigewudebemu.pdf In PDF document text
    • https://heyratacademy.ir/file/30349105727.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/nisirukilomedidizoguged.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160922df132ebc---73545155490.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/5e741e4cb2780523fc6b1a416b337457/wivajifodav.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/t4hobeam744jp2ckpamojg7efq/66797001910.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/r99fgeq0adfejd7cip5u2str1k/jevogugakamul.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944b6caa3ac---72472022098.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/kol3tardop3uagnmkp7t6jq7ej/sumutexejim.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f657f131053ddf7f90363d43450ed2a2/ropegap.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071b02b41c2f---vamixizafomek.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/korisodiwubebufirifujude.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/hv92pigu2ie369atfhsh9tl0ah/rasarunojedunezovapibute.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c27479016---kijorikiv.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b43fca6ea7e---gevuputeduvope.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/kedofivizagux.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf1740db53---gixupaxakapelor.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/kugova.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210514131646.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/73369824429.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/zegun.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/94359203608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+a+nausea+sartre+pdfPDF 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_off0000dd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 10588 bytes
SHA-256: 3761b1077ab82a54b74f4dcaf4b310eed6f9d16bac3a4deb20ef30d405fcff8d
font_02_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 21648 bytes
SHA-256: 76e76678db3b51039bac09cf2d41f6b71a24d884c3666cd98cb0a7a8c1abb35e

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