Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbe2503a78b5010…

MALICIOUS

PDF

67.1 KB Created: 2021-09-13 21:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d941b8b1f225eb001cf8e9acb8657f44 SHA-1: 7d308627a45966eb27fa30aa11b4fe03f9720d6b SHA-256: ecbe2503a78b50101e02829c31ff5a9b782d46bd57e73e874ad4632472673737
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to hide a clickable element. Heuristics indicate it contains a link farm pointing to compromised CMS uploads, suggesting a redirection to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely leading to the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397756ddcdb---xudulat.pdf In PDF document text
    • http://fkhd.cz/data/img/loxavasapataxawomukiven.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/77996686485.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/falozujiluxutupadi.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/2372313604.pdfIn PDF document text
    • http://strap.sk/uploads/files/nirowafibuvedofefulir.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/78114486607.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/48900472349.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613733244da3d---82086077844.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/63495869094.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/8453881353.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/nidatuvetewu.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/wolalunupozosebotipibasi.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/78859496333.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/49122169026.pdfIn PDF document text
    • http://runo34.ru/attachments/file/kutazel.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/55468140411.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/i2udbsor11881t663ug6gn6gr6/89918912257.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/zuvifilubejosijedo.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/duxubelodagogen.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/38344248320.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/81253757345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ppsspp+games+zip+filePDF 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_off0000acf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC504 14104 bytes
SHA-256: b4e6f459e6f06702d6ecf45a89a4045f83af960523689048a28c3408c94df140
font_02_sfnt_off0000e7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 10340 bytes
SHA-256: abb1040dd422f7e7c7a79986ce8b274bbea94ac0aed954ee2fb657a4750f25b8

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