Malicious PDF — malware analysis report

Static analysis result for SHA-256 02244bb29b2326b2…

MALICIOUS

PDF

78.2 KB Created: 2021-09-03 10:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8241d872bcc5997a74056e281e55ce89 SHA-1: 14f38a3e05a39ce5a13cd20d526341210f9f194f SHA-256: 02244bb29b2326b2b6466a3b2e19f7d01e3cd7213fa42c824798552849fef4ae
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The presence of multiple external URIs and the link farm structure strongly suggest an intent to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://bnovum.hu/downloads/dozemusebax.pdf In PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/30652278232.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/uf74gu30o04iv5a0jsv2dtm2n7/gejojefutitasefinik.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b558f4e023d189b0ee0bc07d4dad6045/bamasef.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/bekerijerawedabuvagipew.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210728_175854.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/296b4b19c57082f7a2ec324825eca3d2/16396272405.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/webururomotosafudor.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160add20fb1fd1---dewafasowubi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607902d5a70e1---35099255863.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b52fe002000dbcc4489253d814fbf665/17049363985.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/19215576b54568346485ccc597535a0e/liwawomopaxixizopajebap.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/87239132921.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/44135010759.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcc7b8519d---xodesososika.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/42618511597.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8053b009---22634707808.pdfIn PDF document text
    • http://blueyee.com/upload/file/200344412292.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/29105957511.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/65103ef3adb8d7fe71f13d57637b3bec/90342789846.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16106971184398---5193852605.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084eabc58931---givowegedikab.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/45686568130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=scheduling+system+thesis+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_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 10976 bytes
SHA-256: 4d5399a47856d3f70042a74cd22ffecec8c343c69ef0178d684c797e14bb7bf9
font_01_sfnt_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 17900 bytes
SHA-256: 3e53e9b6597b2974bc779c807a3d6d46b7615f3b2c54e0ace1f8acb83b2b9331

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