Malicious PDF — malware analysis report

Static analysis result for SHA-256 979c6a5863bbfcf7…

MALICIOUS

PDF

90.7 KB Created: 2021-07-23 17:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 89d025cf35ae26cf35a2fc0c59fd6a49 SHA-1: b79773448a0a150b0d8a1e24bbc76f4c3c98ee6c SHA-256: 979c6a5863bbfcf740acf3619649c4d5ced45572a6540586d1c933d05402fe26
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://architects-desk.com/uploadsfile/kemowoko.pdf In PDF document text
    • http://doubles301.jp/files/ckeditor/files/83412553897.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/49bc5ddf182b669b2c2435bba8f83313/vudewuma.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/55748611317.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792e574200f---jagofotizitasulodevewiwex.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/werojijowomukagu.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/sekewotowokijo.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/kopuzisepijoxeg.pdfIn PDF document text
    • https://avela.md/userfiles/file/81592077162.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/l0qagdnfmb62oc61aiqllt9b0v/59146089801.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f9da154c56d---62408084686.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6ff2f7af---zevoro.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097ec4885bd4---xasuvobukedud.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/6qujoq9k606fg60j9tancmdkck/wilabomupozixikomoluxevob.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/40733486671.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/kepiraduj.pdfIn macro / runtime command snippet
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/2ba31c5638486ab0947c63d1762fd052/27388662701.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086826c1e555---60203679488.pdfIn PDF document text
    • http://webbuilders.com/files/file/52891908477.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/34530626502.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6da2397ccf---75491224932.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ac7nbl6mav6urf7hab8uofmpk7/23909854994.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/zimizaxegitu.pdfIn PDF document text
    • http://chpcentre.com/files/file/rejumunin.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/7a511e63cf32786954e70120c5ff78c7/duvusaximiligege.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/8jcump2jhablnjahi32911gbok/93429529141.pdfIn PDF document text
    • http://www.thecoachingtoolscompany.com/In PDF document text
    • http://cesishotel.com/rIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=5+minute+guided+meditation+for+anxiety+scriptPDF 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_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 11272 bytes
SHA-256: b9975031d6b7b6935fc2065e6ecca7b31ef51a0487c526780243f39225eae268
font_01_sfnt_off00011369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 18688 bytes
SHA-256: 566e93ed1b9ece3f8dd8eea1442d5bd6e31a0c6d7041defd6e7d078aca7b181c
font_02_sfnt_off00014416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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