Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4e6550db9f064a…

MALICIOUS

PDF

82.8 KB Created: 2021-08-15 18:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb186c7839a6c34878edb1e3a5de2759 SHA-1: 5bdc9b2cf95bd9356fc9e95f90c05844eae0b733 SHA-256: fc4e6550db9f064af8e87ba2102dd828b599d6f42e4f20f9bd9d12ac1955e2e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or download further payloads. The PDF structure itself is also flagged for suspicious link farming and duplicate object bodies, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/fdd30db6a58a5a10b8a80113a76ec6e6/vonedupozixafeboguroxito.pdf In PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d8f490efd---40128761620.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/o4a2177sme2mb2a375fh0neu6t/wadonipavudadomimojaniz.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609454ccbd360---53207861645.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/r6762v1qgurq6lmnb4s47losrh/86352437257.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/6770392542.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/jewiduroxix.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/zibutu.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/pajoludozivazovewewez.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/a8338af37267275eb4dc25875c5bfc39/wetoboninokuwir.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/95914373088.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f3102946---ronexiwusubunidaradofa.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/eui4i0mc996hoqcfp457ncr9cp/xiwufekojefelu.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/duvafexi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fdf22a0ce70---61316221495.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/senofekekibujefewadu.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/v46at1kb4fbg5ghdsgk37esrv3/70305993552.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32041d9ad4---31390285498.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/dbfb77e0f1746a12d8b2e84586971973/rerurokuzivakiverep.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/jolefizififi.pdfIn PDF document text
    • http://rts-3.ru/upload/files/jalesik.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b77b97bffd1---21516605454.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32a8c6faf---99749270767.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/81771973645.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3v5csalptg9jer1tdcuv0t152o/mepajato.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/67131532250.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ab7131e3d---pefaledupigazagelofulot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+jab+we+met+online+english+subtitlesPDF 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_off0000e037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 11024 bytes
SHA-256: 9bae1a711913b3519e38d8b7599c1f94e7ec477e32374232a30c7a10c06dfaf3
font_02_sfnt_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 16248 bytes
SHA-256: 7f41aac9e4143b9ba47f0b82a251928510b80935c8a022967816faddfad58c36