Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d716aeb58e41e70…

MALICIOUS

PDF

91.0 KB Created: 2021-09-10 19:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9791f405778d36a78d776a856942f4a SHA-1: f6453ab85b5736766bb0077f32e423ae61b2fcd3 SHA-256: 1d716aeb58e41e7001bb01d020656a874b9d5af8f42c8692eabe181b18bc7b0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also exhibits characteristics of a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://queure.ru/uplcv?utm_term=how+to+make+your+own+live+photo PDF link annotation
    • http://wish-pharma.com/upload/files/kenavodamifimepubuwuwe.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/timekimuzidojegumopolipor.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f37012594---18366862957.pdfIn PDF document text
    • https://majubesar.net/contents/files/12872916680.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///36807580071.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/33275286929.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/kapozexemado.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/84930187271.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/f07ca6c612191214500ea9416cfaca3d/suxejudade.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/nelavijevikalivi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaf367fcdf---zukili.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/lojimalokakudivadaseli.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/jalubogexa.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/ralewe.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329306d3da3---45387094950.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/kodufawajovaduwemuvaxivef.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/miponuna.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/51190962039.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/misamesemefafefenewuziwej.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/98890972327.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/13207668795.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/mf0eckvnljegqi6tij1gjjon7s/86745362070.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/gopowufu.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/34039178170.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xifojaxi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014281.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14281 17820 bytes
SHA-256: b6f59dff79973cc9eff4edaa2db6f821ca8d4ff4a07c2c763d322b14a545b934
font_00_sfnt_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 10796 bytes
SHA-256: 23477ee739c4743ece12f8ba4796a7bc9e6d1b76c9645b8e7ba3acaa29012913
font_01_sfnt_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A7 19204 bytes
SHA-256: bb308e9403457321ef9b24ff31fdddf081e3c9d48e4a6941dc2e770416a0a73d

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