Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e4d78e0857afa6…

MALICIOUS

PDF

87.5 KB Created: 2021-09-19 12:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dcd9de3f26334907d7f278ba6ee38812 SHA-1: 663231e1053534cb8f27afd5cacfc9dc0d2d4e02 SHA-256: b8e4d78e0857afa61e8d626b84b8bc0a5a1371d6f6b7ea969aab954093856394
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. These links likely serve to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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 https://inwebjor.ru/uplcv?utm_term=pogo+ios+hack PDF link annotation
    • https://firsatpin.com/calisma2/files/uploads/gapibexululo.pdfIn PDF document text
    • http://enewind.com/pliki/file/90668110117.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/napovezulaviwaxovovo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/4a0258c90ee689a5cd20b434f7abc83a/43517770980.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210919043220.pdfIn PDF document text
    • http://canoeing.by/pics/files/10385173387.pdfIn PDF document text
    • https://thehouseproduction.net/file/49241601090.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/roluvup.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613492d966c5e---bikifefivatibonutamuro.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1a6b7ddce---getefizukomiwuleridetune.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/94917277971.pdfIn PDF document text
    • https://network-italia.it/file/11159708303.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/10884117216.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/vaturiwudigaw.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/xivafekugiv.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/33054866990.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/67dqoc69bircua8ns4cnpe8cda/fofon.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/nawib.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/pojomijubasezilapomi.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/84737385582.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/53697110955.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/6790235989.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ujapegiva.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_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 18588 bytes
SHA-256: 591daebb14b76d91fb19f478e14b47216ca6632fc407517e7761b3ee22d4c8de
font_02_sfnt_off000139bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BD 10120 bytes
SHA-256: 7a6677b7cd2c4660c13cfd3ad4bc4dfdc290ffb6a42257bdf2c4c8a626f61f30

Open this report in the interactive analyzer, or submit your own file for analysis.