Malicious PDF — malware analysis report

Static analysis result for SHA-256 f029a953f844b4b7…

MALICIOUS

PDF

74.3 KB Created: 2021-10-01 00:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a302f0451e090f8c3c125aec1b562e49 SHA-1: d6d6d741b9505dcde61a4091c9725a88cab89acd SHA-256: f029a953f844b4b7f1ce32d316edf8be1811e7a6a3ee6750aa9d0e138af50721
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to malicious websites. Several heuristics indicate the presence of external URIs and link farms, some pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/6eid9608o6br8hddjg4ovipa0f/pepimimejiridekoguxe.pdf In PDF document text
    • http://langmoon.jp/js/upload/files/gapevinuzixuxepiwu.pdfIn PDF document text
    • https://riwg.in/userfiles/file/minebafutud.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/kdkghdmlc472l8tpbrj6ah5op2/dosifagagunibapojuxif.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477796e241c---52138994938.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/21296281709.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/47511604494.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/kajipukuvumobapevumu.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/4636679632.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/zonolaz.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/pulubefakazubijojilolof.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/15090661901.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/29301223570.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/98266258313.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/sogefudivimubumijisazu.pdfIn PDF document text
    • https://norservis.info/files/files/40844957006.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bff04b30ed---92602113007.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/dilapolabiv.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/vibugalirumajixogovikeka.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/10370158704.pdfIn PDF document text
    • http://my-glc.com/uploads/file/fezozopewumufugedef.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/jiribopopazozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=thea+stilton+books+pdf+special+editionPDF 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_off0000b932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 18984 bytes
SHA-256: 28944485abded4f0ca5dceb78cff2e4bcd3936d735f9a5af7263c92b7f7542ab
font_02_sfnt_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 10812 bytes
SHA-256: 84356f3adc6deeaeafac6c8558b205325e260e6389d3017792c815a7e6784d27

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