Malicious PDF — malware analysis report

Static analysis result for SHA-256 402d6be0633c5a3e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 03:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff2fefa17e832b40c8f1fc22d9f239be SHA-1: 1d232f462ab6a260fea44458cc540f7aab3cacfe SHA-256: 402d6be0633c5a3ebebb03446ee3f12a1bd481ef1ee3edd9bbf1e7f93585cc6a
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple links pointing to compromised CMS upload directories and the 'Download Button' heuristic suggest a phishing or malware distribution lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall pattern points to an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/c791fr9a9ovmfkhmum39qiq629/73985451880.pdf In PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/c584de4e35b3dec8ea6033671527887f/kasalakisufedudivomut.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/mofokiw.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/lotusapotam.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608087f4d6540---73963826831.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-23/20210823160619273818.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/9e2d93ed43ce7ab02f368020e633346a/tujorutofama.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/37545983647.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/namatuzo.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/95808c86b9a47693863a507adea44906/5017265794.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d211764b112d5dda51b74e2350ef13f2/waxopevelolufepuxaf.pdfIn PDF document text
    • https://rajaunited.com/contents/files/85356583653.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612684d272434---27598237019.pdfIn PDF document text
    • http://abwva.com/uploads/files/nerixetumufajigazisalugew.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/8147b01f0a692db884d0bf63c0c5dbe2/lepigepavolo.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/96235857fa5ea4e3cd9ffe34332ea8c8/fujazivokunipujiku.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/faborizuriwakala.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/13543237831.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/80121226741.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/39839811569.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44cc9ece7---jegixefuza.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/c5c9a8bcc9b20df377ee02628ac08bfc/talofizuxozazosajiri.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/6cd405fcb4fb2dddee26071f9580c58d/24358873943.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bed08fda52b---99668263623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sahasra+ak+arabya+rajani+pdf+downloadPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/de452a8da2d6ef9250235f4d1fd32dd1/15525954460.pdfIn PDF document text
    • 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_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 11000 bytes
SHA-256: a43a0416ef3fff41f6505c770095ceae655fb01e24dc7cbaf3fa6b25b893c7cf
font_01_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 20748 bytes
SHA-256: 3f9c106db01cff0500342113bbb47faa2f5905c1aa406e4ccf6cfd35f05261f8

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