Malicious PDF — malware analysis report

Static analysis result for SHA-256 5012576a2301fadc…

MALICIOUS

PDF

89.0 KB Created: 2021-06-21 19:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2a56d8596157699f688f733a142da8d5 SHA-1: b7f2c9f4a25d29a21dc242c0640060be649105e9 SHA-256: 5012576a2301fadc49144b8347c4d9156c01b8e350e93acc82dfeee72ea514a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Annie musical script' and 'wkhtmltopdf', likely serving as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=annie+musical+script PDF link annotation
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/o1f0sb1g5d69g711en00n76e14/vefesiragubupimo.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/f9imkkpa1b2mgj2qlvlbr0i496/nidekomidekotorizo.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/68672992466.pdfIn PDF document text
    • https://bamor.org/userfiles/file/12603271509.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48ae8f449---89675367103.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3ce2f343---61858770220.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/82347780160.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b8b8308b7---37013449367.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210617_2D017935EF2D4190.pdfIn PDF document text
    • https://schmitz.cz/res/file/vumegolusixujajezedezuk.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/bezagonoduviku.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aba29f0ee2---xadamemotuku.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/fewajesomolemedinomibewo.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/35202535512.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608506e58c391---99721121968.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/6931dd74e02e4e6b69c42d6796c3b8eb/18733990024.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/2fc7119a0aadfb3a09b518f6c55467c1/dibinijoxelulolisamu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off000109ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109ED 5068 bytes
SHA-256: 7dc6a1446f3d7ef8abb3e975a12047c410eea23b0d6a4c30e34df2fadd035a1d
font_01_sfnt_off00011b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 11068 bytes
SHA-256: 90504176c73b805a52b4271034434df0e28b05f6ab24b1978758cfc622f0427c
font_02_sfnt_off000140fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140FD 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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