Malicious PDF — malware analysis report

Static analysis result for SHA-256 498ff9277163225b…

MALICIOUS

PDF

90.0 KB Created: 2021-07-23 16:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ae73d129a46eb44fbbf233cdd7f6bf2b SHA-1: 3615a6339ce2882bd1739a0708241f7731912a67 SHA-256: 498ff9277163225b3d886e8e231c3a9376af3414fbc16d12f5f56a9a2824efb7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, forming a link farm. One URL uses a raw IP address, indicating a direct attempt to host malicious content. The document body is heavily obfuscated and unreadable, suggesting it's designed to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://dralituncer.net/userfiles/file/kezufewominag.pdf In PDF document text
    • http://cmuniontravel.com/userfiles/file/33850100730.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/553dc24192f21528a8075113e4b924f9/33211774906.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/94its5nkqe1jjgei81dkfvu6v1/58159029655.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/nspnt5btj210d7rb2c9jtfqu9f/taxitigirojafulok.pdfIn PDF document text
    • http://bienbao.org/uploads/files/96839629391.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a31bb9c4773ee4b9d0a9087edd946f91/93088626685.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/1a2932dd08c2b51934e9307cfbc2a816/67487178832.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/90449154535.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16099fdd76db34---58456726117.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/39242250504.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/vhg2u0p79i1v2jh7upg5qr79h0/87478165330.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9a3fec09e---suvorodalatarufidomikemo.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/fekadoxititifagi.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/miwekojajaraweku.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a06078e68---78661435126.pdfPDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160731147cfbe8---wevuduvobebujibani.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c58355832---rekobulotum.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/24234925291.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42164c03af---temogopunajogidarijoroza.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d724a1655b---96493401339.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/boxikutigu.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/30998782505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+do+i+change+time+on+my+samsung+tabletPDF 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_off0000f8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AF 11148 bytes
SHA-256: a92bd259570178fa2e5cc21555c4709a96baba79e66dbb4437d31eb86aabeb69
font_01_sfnt_off0001125c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 17132 bytes
SHA-256: 9ce5fc528d036209dffb7b932dc2e4d86cfdafdd4a46d87a72dd7e559decd6a6
font_02_sfnt_off00013f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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