Malicious PDF — malware analysis report

Static analysis result for SHA-256 281decab228b19d0…

MALICIOUS

PDF

72.0 KB Created: 2021-09-23 13:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dcd2ef385e9cb9c5708a2a06cde0c159 SHA-1: 7219929cd2b1b297dd12ac13dd85f8ab96077dfe SHA-256: 281decab228b19d0a88cf4f591d59076367f9bd219d47f05ed03406215d8ddc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to disposable hosting or compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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=pokemon+fire+red+game+gba+download PDF link annotation
    • http://centralgiving.com/media/userfiles/file/96297165937.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/92087415450.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/13kd95q8ut9lmr0j2vhn1ng285/57743234338.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/xegik.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/xajijufidewup.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/46308766334.pdfIn PDF document text
    • http://ausafe.net/images/art/files/10325759644.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/fanapaxin.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/56684091418.pdfIn PDF document text
    • http://smirna.pl/files/file/9392958796.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/vikopi.pdfIn PDF document text
    • https://zufiks.pl/uploads/userfiles/files/54904094863.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/48247911330.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133dcb9c6059---xorukodobafidabefu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8d4967113d48a9ea22c544af40dda7c7/93518886222.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/9e3c0243bcf61d7db4c3bd6113695ee8/67886605385.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/nudusofiropazuselulapa.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/926137044.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/83158284256.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/sofumixew.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/64858146523.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/9446514643.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/gupogovuzavafikuwoge.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/29473362888.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/luvunubifiwanodasi.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/rujifanesitezotejotixos.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB822 10748 bytes
SHA-256: 2dc8ed621ee0a00683b36e8e2fa91258ce234d52f4783a1aaac7b9815e69d19d
font_01_sfnt_off0000d09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09F 16020 bytes
SHA-256: 52c97c4a9994bab838f99eebff351bf2bb83867d960e2b5f7870dabc3a04303f
font_02_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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