Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e827388c9cd0538…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 03:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c20374888b5a5066d183d3beb4b15b6 SHA-1: 1797e3820a6befb4782fc977fbc4a9cacd14bf31 SHA-256: 5e827388c9cd05389ea20c6adc96fd21c0adb6731e07117e8efb189c8bb1c9d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, specifically within formcraft plugin upload directories. These links likely serve as a lure to download malicious payloads, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609998c422133---11894422318.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06151c0a4---22466413198.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076da035274e---tilesutu.pdf
    • http://alexlunacoach.com/img/editor/file/11022914890.pdf
    • http://oishisushigd.com/uploads/files/jepofedowok.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5cd902c1---wulene.pdf
    • http://flygarfield.net/userfiles/file/44877177084.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/54d5220a5de72c828b4a96c32f8f5dcf/3453343418.pdf
    • https://agmatbaa.com/upload/files/bodedivewepodato.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074adbb3cf49---68179554452.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607453c46a868---xonevunefadonomujeg.pdf
    • https://nhachoxebus.com/upload/fck/file/69534476684.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ng3tt6noegsk9alsal052m8854/lizomuwoxono.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071120ca1962---62805649890.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf29e17f9e---23699307065.pdf
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/moririni.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f74e3aab---35627421894.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/jivofikiwan.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6931081610---vapoxovijilutan.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/a1p80vor1qfv4vkjntc5mbu3ah/2122041452.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90f9c965c---6660088067.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed254109f---fuvitinudiginimuperegawel.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa49ab4aa7---negivatidujogelalub.pdf
    • http://timapools.com/uploads/files/jatitenef.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=solving+systems+by+substitution
    • 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_off0000e782.bin
7d1a5c2f1cde70953c5a282d1e1ead0407efe92cca53895de1dba756c6eda801
pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 10684 bytes
font_01_sfnt_off00010009.bin
388ca8a8e3e6b569b54d4e8fabd3e5c0c3bfa732e003279826b8ba3f8752f9d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 18280 bytes
font_02_sfnt_off000130be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130BE 16792 bytes