Malicious PDF — malware analysis report

Static analysis result for SHA-256 491ec0a476e2e2ed…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 00:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f24b9d4502403eef07ba382ee7138ed7 SHA-1: 82c021e3d41e436a13385cf712fb7bcda32241f4 SHA-256: 491ec0a476e2e2edd6bbb0bce61bbcf0f7c4b3f726250bf79fb320c312a350d0
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The presence of a 'download button' lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a malicious intent to trick users into downloading further malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=application+word+pour+android+gratuit PDF link annotation
    • http://sino-web.net/filespath/files/20210908061138.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/27777686338.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/322969482.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/pizura.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/67438793375.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/68029729219.pdfIn PDF document text
    • https://promise-land.com/upload/file/banifito.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/dogukasikigokunu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f098c1078f---gobosalabenako.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210914035353.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/60ae88042a38879437c6a3c7685f195a/gikibuvekimivu.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/rodaso.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/vunujixu.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/mapuxaxowosaju.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/35178556063.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/6b42e7177482817a99caddee997e3e1d/xogusadogovi.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/kituraxegenoneta.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/delovususiga.pdfIn PDF document text
    • http://aa-nusd.jp/dudonibufufajewudufetode.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/tenaku.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/93383697889.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/24lmukfk9dnj3geatfa8jsevg7/84405579491.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_off0000c537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 10556 bytes
SHA-256: 5ffd08abebbdac3049cd3a27c08c1cb8ea8f29666a1a6ed07b42336d9dd8e91e
font_02_sfnt_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 17780 bytes
SHA-256: f7e906251caa2e38b2697bc08ceba9aa7acb2cce398236a976e19f5423e59f5a

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