Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8877db25dbb5cda…

MALICIOUS

PDF

89.6 KB Created: 2021-07-04 18:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5f29c9e30f928bbe3869e63cf0c1f1ca SHA-1: 429b16847d60fda86af993242440603228c585fa SHA-256: f8877db25dbb5cdad25b157b0dd1de17659ffae68b38980ac2cbcf974ebc7026
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised or disposable domains, indicating an attempt to redirect the user to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick the user into believing they need a password to access an archive, a common tactic for bypassing gateway security. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/zixenupasozegisivakiribo.pdf In PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160942b5575d11---32580071728.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/zusibevopuzelakunigopido.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/c37hdro7v2l1ai7m4dui274uh4/16879300628.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/68967842570.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/73663014962.pdfIn PDF document text
    • http://dgjst.com/upfile/file/37146899065.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/gikavavutadijuzupefef.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079525035878---6797570524.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764659effbe---xinurenatososebigon.pdfIn PDF document text
    • http://accronline.com/userfiles/file/36564089237.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/kuzurarimazuso.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/lixasuxibunuwolopagos.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759b21ecf88---bivonaruloraraburufoxev.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c226d7a372bc60cd6e64d51e442807ef/53895837579.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/1j5t71n2tbhia0sq8utihcn9a2/41308912205.pdfIn PDF document text
    • http://isgsrl.it/images/file/15821139490.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/b26edfda2020e182a510a4ea78eb6950/pogawabafopokamixez.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/93611912fcd522724c46bd3e9c9cd28e/vevax.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4978850706---96205203049.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/futosozifivude.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/77858703727.pdfIn PDF document text
    • http://goref.ru/files/file/tuvesubibofipubis.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/dozimenomid.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/74b757f37874773af2acfd0fe689ebdf/pokavupakavojajumifige.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/jokojovonegexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=red+fox+with+white+tailPDF 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_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 10312 bytes
SHA-256: aea3d4821606c37c99fa400291ea6cf6c3bd05c44ec3f353ceca45df0f780480
font_01_sfnt_off000114a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 17064 bytes
SHA-256: d2d4c38c57b899213de20fc53c1a0ef394b1c9c6a7c613699d76fba715ec8792