Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d80b18a057f985…

MALICIOUS

PDF

94.7 KB Created: 2021-08-20 04:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f6eafc368328c68563529a6b53f1d27 SHA-1: 3bcb9f2a4d03ea7ab6c87cc4f177711da48f93fa SHA-256: 54d80b18a057f9851991d5e0a5f42a457bfcf230135d4b9f0d749a3798c3f690
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories. Heuristics indicate this is a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160741bb38e290---leboka.pdf In PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/vejatosogu.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/38260076152.pdfIn PDF document text
    • https://purefeeling8.com/data/file/jibogileta.pdfIn PDF document text
    • http://reylab.com/userfiles/file/vojazatamupusoboxikaxaxi.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/tizetono.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/55725841645.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/63qadubiihj38i4bk06l5jp8mg/zazupifuwugegaritunozej.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a5d5d59e5e25b3766b7db9035df5f0c7/nufeguzosuguwinolaw.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607060cb5391d---46257151524.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/65a702fe96a0651752d1468a78a99e9f/86975219340.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/xevanuxadiwowa.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210719_818EB27EADC2D505.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/siseruzesonexuwojubif.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/781928dfbb0c37d086e418749ebd80ed/30166061584.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/52700170420.pdfIn PDF document text
    • https://europartner2.pl/uploads/likamonozepamivebaresupe.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/nulutesekonotaxijorezax.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/4792001981.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610a736d9d173---36881878620.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/bejusobodovapusewovujeni.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/42418464124.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/wosaxa.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c973b89b4f4---rusobufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=terraform+data+aws_availability_zonesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 17964 bytes
SHA-256: a445c79929ed85038aa8ce770e449f4154e1b77e009aeb1deea5f1fc33c177a7
font_01_sfnt_off0001246f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C86 10976 bytes
SHA-256: 38deb3f2bde7b727eefe12854e7dd98cb69e5ffc28a6ce0392c9e09234ed1b5a
font_03_sfnt_off0001561d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1561D 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58