Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ed85611a826576…

MALICIOUS

PDF

104.6 KB Created: 2021-07-16 08:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 10f9e0eb0ddd5dd8bd0ef69de4cd14ee SHA-1: 911026c579d1beacd8ccf1dcce3b7c1e3da7b21b SHA-256: 59ed85611a826576c420fa69510829fb4819b89bd4732ee4089e51b5de59660e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the embedded URLs suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=st+sernin+cathedral PDF link annotation
    • http://vaikevai.com/ckfinder/userfiles/files/88720274922.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/truk13rv6ei6blqf09413d6rfk/7270751023.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/pjempk0lh2185ro6n9va862o9j/riwedowozepupebifawa.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/41ede6ee25bc4412fa3168c0151128d6/duredaginibovizedofiw.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160820c05d86aa---68088983890.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/08ddc81a42c6fadf8e36120c791e2189/nuvakitalosuxexel.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/aa598d8004bb166b9e586e02c7cc86bb/36980684505.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/rojutuse.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/8uqlbbjgbpkmsnn6osd2c3gpuc/rikeratapilajotuwi.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c3a156f2a---kutijedejogafuviz.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd0f32a528---zamupevar.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/xifetovime.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/44773478080.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/7809626805.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d13fe5519f---wameradezetikosem.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/15757631631.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/fufokuxafulapove.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf7615df8e---42568292095.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/84886188454.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bed1a378ce---89203157510.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/299fc988871cf6c0f6dd826e087f6701/fabezegomekakexidulojuva.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/t4k9i98ba07763d7eo5i9efmb7/muragi.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/1932643b313884e53f5b8bb3c7a8ab08/zunesite.pdfIn PDF document text
    • http://trickorsuite.com/clients/5/5d/5d84d12f6f4dfd10bbe5497c884a5f3e/File/zalilojerabirovi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011724.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11724 17384 bytes
SHA-256: 72056cd6524bf36655f15b66cce241b943e3cdadfd5a4425c6fdac5bbe37c658
font_00_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 4032 bytes
SHA-256: 218f3ea596b47531611cc49de284e65c4745e9f40b15f74d28346afffb11182f
font_02_sfnt_off00013146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13146 20040 bytes
SHA-256: 0f7b8cef7a5f87cd1b961501f7da485dd4a71fb2cd5a696435c25d11e13a4929
font_03_sfnt_off0001632a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1632A 10424 bytes
SHA-256: 81b137ae452a4e6617613926c94bfd0ba46dbdd0edc16e9178ee9bd7e63c4058
font_04_sfnt_off00017aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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