PDF malware analysis — malicious · 14e73f6abf78fc6e

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 13:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: ec039bd42c3328899fa454427b9a6d20 SHA-1: 91d6203d31f03fb7eb6b92a853c1acb51bd27294 SHA-256: 14e73f6abf78fc6eeb6eec71a3161e9a8f2bbbb0f89464070437cb5e8b9368dd

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a link farm pointing to numerous compromised websites, identified by heuristics such as 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The presence of these links suggests an attempt to lure users to malicious sites, likely for phishing or to deliver a second-stage payload. ClamAV detection further supports its malicious classification.

Machine Learning

Nyx PDF Classifier suspicious score 0.4037

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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://bukhatirhomes.com/userfiles/file/sogapozibivujatotogo.pdf In PDF document text
- http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075de2675fb8---59786864466.pdfIn PDF document text
- http://syuncyoku.jp/upload/file/47153689311.pdfIn PDF document text
- http://timebank.ru/sites/default/files/photos/pagefile/xadave.pdfIn PDF document text
- https://peoplehelppeople.net/uploads/File/55730399923.pdfIn PDF document text
- https://presstone.hu/userfiles/file/53262662515.pdfIn PDF document text
- http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083da5119e36---jenidunoteluxuvowosulijin.pdfIn PDF document text
- https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/96f5864fd39dfd8e42888a8f35e8b267/75498497845.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/22e1b0fb2b40dfe9e28bebdb8c27c6c7/9966218032.pdfIn PDF document text
- http://www.biotanika.pl/upload/file/neguzijetudinofogixog.pdfIn PDF document text
- https://ringid.vn/ckfinder/userfiles/files/ladavobidetoxod.pdfIn PDF document text
- https://stotex.rs/files/tuvenesonu.pdfIn PDF document text
- http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161040e6ac493e---badokutiferudij.pdfIn PDF document text
- http://lepal.sk/ckfinder/userfiles/files/67315449856.pdfIn PDF document text
- https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c07b9c908b---didawodilenu.pdfIn PDF document text
- https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/221b3ebf5bacfa957f0cbe8112ae46a4/sawelonaxonesufutufov.pdfIn PDF document text
- https://songhong.info/userfiles/file/10868972859.pdfIn PDF document text
- https://alihuata.com/userfiles/file/98169470362.pdfIn PDF document text
- http://lasfyy.com/uploadfile/file/20210601225217601.pdfIn PDF document text
- http://lohs69.com/clients/82366/File/muxivisufowebosubotibunok.pdfIn PDF document text
- https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/5occ2srrvhe4mjqoaa9r92v5v7/diwuwitewibupogebix.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=empire+of+the+sun+book+pdfPDF link annotation
- 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d76a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD76A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ef81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF81	10872 bytes
SHA-256: `a9f29aa8740543df88d1240143b5e66bde2722777bfd471bf93eadb3cc106e44`
`font_02_sfnt_off00010823.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10823	18956 bytes
SHA-256: `ee045c5ad124c96f75c9b6439dc05568428fc245f54ac3b8cf73be08f11afbe2`

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