Malicious PDF — malware analysis report

Static analysis result for SHA-256 246af45b26371005…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 05:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dbcfd5d3e02082cd4b81ce5d148ad299 SHA-1: 5917e94375bf5965fe88bec4002d3cbf1b875dad SHA-256: 246af45b26371005403e9d2a53c2a02b8a8765853f26601613af882c9b37a502
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=nexus+7+2013+touch+screen+not+working PDF link annotation
    • https://bipalisdemo.dashindonesia.com/userfiles/files/63176078364.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/94741380045.pdfIn PDF document text
    • http://artio.pl/files/files/xobibifomipanore.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132402772a2d---sediposu.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/6852964704.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/97488355496.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/51359642447.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/50251409601.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/20035592366.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/puwijojewadejepapo.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/vezivexakaletazugidoj.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/bipivarizati.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/fibasixaguduwawigoratoko.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/75483537081.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/5cab86b6f0b36b21dbf35b6ed1a08542/zikagisatujid.pdfIn PDF document text
    • https://e-midas.ro/files/file/60625988337.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/61580520555.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132cbe0dcf2b---36196125880.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/83847979189.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/92089982843.pdfIn PDF document text
    • http://forti.in/userfiles/file/wosovonawujapedaz.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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 11176 bytes
SHA-256: 642b382340ed05a5a863f19a18526526b91f94bf76b2236a63c938cf455777fc
font_01_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 19192 bytes
SHA-256: 3a85e314bdbd7291b072e176cef93fc961391b8b59d9100973b6c896b0b226b7