Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da238f0bf16bef9…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 07:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57ae162b52f72a2f40b7f3c1a4029cc8 SHA-1: e66fd2a7785bea6d1bdc867d884ba8194db25f21 SHA-256: 1da238f0bf16bef949f8773468bd70bd3243be0c567004cac6459744b94c74ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains. This behavior is characteristic of a link farm designed to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://botosani.ro/img/uploads/file/xawutovepadoluvegi.pdf In PDF document text
    • http://virus-safe-zone.com/ckupload/files/mixogaxu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4f392f4c3fb164975feda8660b72da0e/820401025.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb13dc163d3---vutakexene.pdfIn PDF document text
    • https://mihalex.by/files/files/zubupug.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/oqhus7os2m2la2f6fnh45aeva0/20848637691.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/milutejizalutuwo.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/4369852298.pdfIn PDF document text
    • https://red-adlay.com/upload/files/fiwerifopubofavipa.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/nugafedabiviroxixozir.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3078668e---kisujibufusuruvugi.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/15616635017.pdfIn PDF document text
    • https://asi-filter.pl/files/file/jabolodeluxupomos.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/fijekogifowazem.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/vololawukenowijidawola.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/siduribusobizuk.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/ed506fc2cbcea903e32ba2583f8b6421/62957574729.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/fovipixubijoguxukowubi.pdfIn PDF document text
    • http://evola.it/userfiles/files/mifutizovusenuxujukupufam.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/15261171910.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021052501171173499.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b1c81bd67---bupilinutovokisibozeto.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d649395ae---64552937422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=welding+metallurgy+of+stainless+steels+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 17880 bytes
SHA-256: 8589a488c241f2d605722094108bc3e70e197ae352f111d4e936b0f86fba0de2
font_02_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 11048 bytes
SHA-256: 631c7b40903c71d64a831cd0a234ed46697ea741c29a7912a1985f07d0e898e1

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