Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e4ee953ed07f59…

MALICIOUS

PDF

79.6 KB Created: 2021-07-03 19:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b4a386f6a52ed4f1b241d5d60ac705f5 SHA-1: 2a36d7193b796c98a7ad876f2b1290d435b3a0dd SHA-256: f8e4ee953ed07f59cf13eb8b5e06a2d9269412c7357e1f9aacb05d0397d81bfb
176 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://locoffice.ru/userfiles/file/defibupokugofipazi.pdf In PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/c131dd81fee1a19ee31eba118b7d3e8f/xenizaraduni.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba745cd12---19947913217.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/p8leo7iv6h3fklni1lknhhadaf/85058045441.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/21550758493.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/0acpb84j7ch32tj3svabq21n3o/dajekopumojajerasamirim.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/767227ce5a9eb3199112991a302c12ac/guwajetudisesit.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/99932333717.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/dcf5ea429e7986cb19bdfd9c2bbe8765/20602926525.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1615ae6d1---xazaf.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16091f6faa51d5---vozodares.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/mawuxanadedefabezenupo.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608c38f609824---kurolisifisuzijeburabona.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609119667366a---rixikugemorudukinele.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abcf6e430e6---napufulirowajabelujezeko.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/7435936885.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/pupekekuxipadonilere.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fc3df7c6676facd7996a4828fdaa4e57/balanigobuveriji.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/somowozutakokimenupikif.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/51786844049.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/50785456265.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083088d0f847---vunamebekumivifo.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/22498718990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=tales+of+a+musical+journey+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B6 17636 bytes
SHA-256: d244ecd0283148498a2bfd21a71ff25a1deb3b2e106988717e9e945b35260e17
font_01_sfnt_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 10988 bytes
SHA-256: a5eafbd9b5c28a2d782a8a802504bd61f95d930d457e1e4671cc901a0ed6704b
font_02_sfnt_off000119c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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