Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae525feabef382d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 19:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8197c93c469d4c071ff2c7b1dc390c79 SHA-1: b2989550870d68a00d8fa6a4d7f33314cbed92e0 SHA-256: 8ae525feabef382df3ac4ec03ee13226f17a278729031e944ecc04fb1ee48209
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm and was identified as malicious by a machine learning classifier and ClamAV. The embedded URLs, particularly those hosted on compromised CMS upload storage, suggest an attempt to lure users to external sites. While no scripts were explicitly extracted, the nature of the link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cegled.varosom.hu/userfiles/files/75673312203.pdf In PDF document text
    • https://nationalshield-uae.com/userfiles/files/48722049267.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67bec0aac65d00f657bf6a973c03567a/seniv.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612d6238c3c6d---gajajenozuwejede.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/pegisogiwugoje.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebca682f4e---xidodadivanejugesa.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1fdaa6319c4650350f1d5aad7e1ea602/revipimu.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/rs0svmumkm6gsa5u2qpjb9j6k0/68600760055.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/16251815625.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/27895534294.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/43593081675.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/22413206528.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/98548928268.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/fugotosikimaxinowumiv.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/ceb0a24eed3352c0c902ff354bc8eb08/3619694350.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210528190036104069cxb32p.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/wojamikabuverulodidodu.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/34909578062.pdfIn PDF document text
    • http://recviem.ru/img/upload/41618862101.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/megelerozovozes.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/10110830921.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/nusumorowag.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/mebazilefowulaka.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ecced6a2d2ca0007feb2b6bb5e59f83c/mozomagerolewubewovewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sony+rx100+mk+iii+manualPDF 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_off0000e381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE381 10528 bytes
SHA-256: 443e6bb3c4d56d0351ab0b70da640b4ce874898af527c0e7a5343c6cb6a283df
font_01_sfnt_off0000fb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 18128 bytes
SHA-256: 39cd60a62f8e18a880675f841dc93699c968836447737be11f53c4942bd3373a
font_02_sfnt_off00012a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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