Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7f2b9ded36ab93…

MALICIOUS

PDF

88.7 KB Created: 2021-07-18 12:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c285996800b719467f3cf43be56e86e0 SHA-1: 960a12aec0c9956ea96ce84ede327ea3a9025ad7 SHA-256: bd7f2b9ded36ab93d52ea87baa84d2978ead477ff05dc88fa9ad416782968a30
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. These links are likely intended to redirect users to malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943f652b061---68250663980.pdf In PDF document text
    • http://ankaser.com/userfiles/file/xuteno.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/43038230388.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/merijevowulane.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087dffbc2839---rakoginulilamajo.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/vewifefut.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/21557293758.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160826452ae6f9---kegakexomupijulinewonune.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/8826109437.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/015314034f325e60237f1472bc03a5eb/taroxi.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/12984081677.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92c1a2baf9ea5812e73dc9f8567a79c7/raxawovose.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/39189738859.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b656772d---xuwagirobepelenodegewo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160debade0c123---daxumowejidukobewub.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/lekakiremutorurepufo.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894214729dd---pututiripegoxonuxa.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/60536275923.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/sereziw.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/dikidelowam.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa7bc472c---vurorutirajorepusigega.pdfIn PDF document text
    • https://efnnma.org/files/file/15577677499.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/27651546518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=counsels+and+maximsPDF 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_off0000fae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE6 10444 bytes
SHA-256: cebce4764cd5b1ffa45fa9fabcea05b631b0298a0a516bd2658fc7ba4dddce36
font_01_sfnt_off00011296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11296 16692 bytes
SHA-256: 80aa0d4410d6d15722bbfec74a2529530a639ffca4353f0c5019e50e6c4ef602
font_02_sfnt_off00013dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1