Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0857eff8eb6be4…

MALICIOUS

PDF

95.4 KB Created: 2021-07-14 01:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0fafa332d64347fc3291048b2d51bd80 SHA-1: 8fbe987920e8f337ebf201605f1702daa1e08528 SHA-256: 3f0857eff8eb6be441d8b09dcb20dc3518175eb4239bcfd99561912275c863aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://laborke.ru/uplcv?utm_term=the+meaning+of+af PDF link annotation
    • http://turar-mussin.com/userfiles/File/mejaxamanoruximokagun.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/takaxeribazibuz.pdfIn PDF document text
    • http://babamoleskine.com/files/file/lolarowopigusunili.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/fu511no2v7bisblm37seebpuqb/24744359230.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/rizenetozexebir.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/49269463612.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/bofebasedi.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/mabokunubivuzoxiputukekir.pdfIn PDF document text
    • http://evola.it/userfiles/files/gabowatodumawejiwem.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608398a3cf905---xawatojafo.pdfIn PDF document text
    • https://menu2uplus.com/images/file/30363035797.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/39536470545.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c9b6a81ecc98b24a0d7c626f37cdccd4/ditiravujodisiwixekeb.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c931fbb56b---tewagafuvuj.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc55dc8d58---4631497820.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/gavazakij.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/40009280290.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ca8f50533ed3733060cdc360aeb8ca9a/32322046321.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/95758606930.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/emrftk1ca02h3smfmch5760kc9/15867324314.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/49517429408.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/10851186567.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bagopuzobo.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012e02.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12E02 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 23980 bytes
SHA-256: 5121029a1b84ff82342f5079267e2a9785d0f928500fca1ec02a93b8309aacc1
font_03_sfnt_off00014ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BA4 10212 bytes
SHA-256: b1b99b84b2f49133c5fa617aae119879503912529421bb69cb4c88aac807fd8b
font_04_sfnt_off0001624a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1624A 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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