Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe7a07a27cd81e50…

MALICIOUS

PDF

98.8 KB Created: 2021-09-04 18:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d440f9cd005610ab242daad33670c9d5 SHA-1: 49fd0b74a3dacffce4f4b2bd8b0cdf948a01733e SHA-256: fe7a07a27cd81e50df31182fc594f1a5ac7f36cc5d89eea44f0ddf49ced3dc83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a link farm on compromised CMS uploads, coupled with multiple unknown URLs, suggests a phishing or malware distribution attempt. Although no scripts were extracted, the PDF structure and embedded URLs point towards a social engineering attack aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

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
  • 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.
  • 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://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606e280927e4d---jimefopekalagalewabotud.pdf In PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/eifeng2j51hjl7tfma2dboc26l/89641111824.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160f723c7ef9dc---zaruk.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a5b8d5c54ea50dc363eac6ee6a4d625d/54256193897.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074460c14c59---67852921670.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/tiworazorasa.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb16b737c7---71640484425.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/lafonaw.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/lokezupepotifoketaralusak.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/50775256542.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/kawufopemev.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/xipisonuzuzeda.pdfIn PDF document text
    • https://petala.gr/userfiles/file/80294047524.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/97318062335.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/dawesus.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/17415706055.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/nukir.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/25610279602.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a316e4e7072---xezanibugomugekulumodavi.pdfIn PDF document text
    • http://gotween.com/userfiles/file///fovajevopowubom.pdfIn PDF document text
    • https://ntc-container.com/upload/files/22684936038.pdfIn PDF document text
    • http://barksdalereunions.com/clients/869108/File/jewis.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/caf02558adda95f79a6068cd289ce726/kuvewifamadetebuwizos.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/ladumamolurupakef.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210701_D6834B55BADB457D.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=yajur+veda+sandhyavandanam+telugu+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 25128 bytes
SHA-256: 9844c597b87c6229f83dcdf347dcf1255190be29713862b66681196d603b4f49
font_02_sfnt_off00014231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14231 11128 bytes
SHA-256: 58c2fe182b2a73f3a2f5826b599ec260f1ba9a64f996d16e69d44d3063ac4af8
font_03_sfnt_off00015bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC4 16436 bytes
SHA-256: c85c083cb29707e9447be67577c81ef4dbab5b8754c9bde560d7022ada9c8084
font_04_sfnt_off0001729d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1729D 2128 bytes
SHA-256: 612cd5c70f487f82f128e08f6c1a101e52ba34f65993c4dc5bc4253f0511cf1b

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