Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f4bfcd6883867f…

MALICIOUS

PDF

142.4 KB Created: 2021-07-31 07:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 583dd4efbc698b96a26344d8b1c03057 SHA-1: 5747c88767d9aa22f7be8538665fcbda3843607f SHA-256: 48f4bfcd6883867f1a905642474bf1e4f047db0bf87fe7439f4e6816fa01a5e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://bluetact.com/locktactyuma/userfiles/file/pugeja.pdf In PDF document text
    • http://airmon.hu/images/files/gabijibetolijur.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/33634917765.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/kiruxozareloperofa.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/voparixupiwiguletatugawe.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a98817b2---66862570235.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085263be26d9---kalagubevosoge.pdfIn PDF document text
    • http://yejida.com/userfiles/file/kuterubisumamotonasenese.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/retezo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089c593a5781---sigonurenijoxasuwi.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/15074522317.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/0mrbuoiuv2remf88fqdsfr2fu0/75871514776.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085481eaf50b---kitujevenodovizotuvinow.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/kulirufibupogiw.pdfIn PDF document text
    • https://discoverthesky.it/file/loterapumeruripejufo.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd658882c6---potupitefukatetilive.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdcbcc65df---21090713378.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/57210945268.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/98359171669.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84ff738a1---96083928299.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb1a27e78---tiwijilujewaweguguku.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/pamilotefuxamomuxegazusew.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3a918c3949579bd37be81e97dc37a43d/tamanurif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+long+should+it+take+to+become+a+master+masonPDF 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_off0001c5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDE2 11224 bytes
SHA-256: 75353752774e26bd3d77f54eb8c7b71a60f12b5a45ea82e71f4bf7c894c61602
font_02_sfnt_off0001f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7CC 19180 bytes
SHA-256: 19b9ccb856ffcec1f3ff763569ffa9457e9ef2492f3cce8e0a5b1cb0438b41df

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