Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6087ebba45971f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 22:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 193553a524f79316fe8869033e57231d SHA-1: e059b25d42123136f0fba0bd912e0aad21e90bb7 SHA-256: 4b6087ebba45971f1b814dd1951a76552c39cea5c30006e8f65ebb250ac3a2cc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and link farm heuristics confirms the primary attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://laborke.ru/uplcv?utm_term=brother+and+sister+having+sex+in+the+bedroom PDF link annotation
    • http://www.xzass.org/ckfinder/userfiles/files/96228109014.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/nopuwefafatiliri.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/gizupelalajupilosaxaxe.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/dokigajumoso.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/45952432345.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/nuxidajotagaji.pdfIn PDF document text
    • https://wrd13.com/force/file/71091626570.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/kozuripewej.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/18cb3f13bfe3b13ecbfbfd38c790c94c/vonamimixa.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/71438202190.pdfIn PDF document text
    • https://termofriz.rs//files/zawojerip.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/zusorebosidotozu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b6efbf548ad1f408b728270bd32dd749/30582876081.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee571f39fde---79751991803.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/cetn2vcj1tqg1i4ork388mg5t3/25892464975.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/lowonu.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/4111385db820b814702e0442c3d1ff77/38392324790.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1578f7ebec---62425655202.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/49168904379.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/31137320748.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c71522c49---busezubuwotu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5252b60556b7561e0159b90db4fa86cb/54828121579.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/rakizelirafalawep.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/50961cb29bede390a146813cd82ccd2d/gaxinuwusotutadogum.pdfIn PDF document text
    • 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_off0000d49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49D 11012 bytes
SHA-256: 31f918f6570f9547e42e8681833d34fa553fad01caad4d259e14b9c1562ba680
font_01_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 17144 bytes
SHA-256: bbb150e2ab059c6985bc67557ae0d6ebaaae29c6304b942c9237b84a0d90852b
font_02_sfnt_off000119e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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